Ancient Aliens

Ancient Aliens has met with eyewitnesses and travelled to the sites of UFO incidents. Now, Giorgio Tsoukalos looks back at the most compelling investigations of all, and events that he believes represent real encounters with extraterrestrials.

Ancient Aliens has examined the oldest and most mysterious rock art on Earth. Now, Giorgio Tsoukalos takes a look back at the incredible hieroglyphs, petroglyphs, and geoglyphs that, he believes, tell a worldwide story of alien visitation.

Ancient Aliens has investigated the world's oldest and most incredible relics up close and in person. Now, Giorgio Tsoukalos takes a look back at the most mysterious artifacts from all over the globe.

Giorgio Tsoukalos takes a look back at the most incredible evidence ever uncovered that could offer definitive proof that we are not alone in the universe.

Studies have shown that up to 70% of all UFO sightings happen in so-called 'hotspots' where reports of visions, mysterious lights and unusual phenomena are regularly witnessed.

More than 10,000 crop circle formations have been documented in over 50 countries, and many display properties that defy conventional explanations.

The discovery of the ancient megalithic site of Karahan Tepe in southern Turkey turns the world of archaeology on its head.

The obelisks of ancient Egypt was perfectly carved from a single granite rock.

MUFON is the world's leading organization devoted to the scientific investigation of unidentified aerial phenomena and other unexplained encounters. Could MUFON's extensive database contain definitive proof of extraterrestrial visitation?

Meteor impacts changed the world, creating the ideal environment for human civilisation and providing essential metals. But could new evidence reveal that celestial objects have been directed to Earth by alien intelligence?

The Center for the Study of Extra-Terrestrial Intelligence defines a "Close Encounter of the Fifth Kind" as direct human contact and communication with extraterrestrial life. But will this classification only become useful in the distant future?

The vast Alaskan wilderness is well known for mysterious disappearances, electromagnetic anomalies, stories of strange creatures, and UFO sightings. Could Alaska's many mysteries be due to a presence that is not of this world?

Pilots report terrifying UFO encounters, including aircraft control takeover & entire jumbo jets vanishing. Such unexplainable events have occurred since the dawn of aviation, leading to speculations about extraterrestrial presence in the airspace.

Enormous megalithic structures of mysterious origins - could the ancient mysteries that exist on the Mediterranean islands of Malta be connected to local legends of alien visitation and giant hybrid beings?

Counting down the world�s top ten pyramid sites, from a valley in Peru with over 250 hidden pyramids to an ancient Greek city with mysterious 4800-year-old ruins to Egypt�s famous Giza Plateau.

Counting down the world's top ten mysterious devices, from strange, grooved disks found in a cave in China to an ancient Greek computer. Might these sensational artefacts provide evidence of extraterrestrial visitation?

Counting down the world's top ten mysterious islands, including sites said to be home to giants and islands that disappear into thin air. Could these incredible sites provide evidence of extraterrestrial visitation?

Counting down the top ten alien craft, from V-shaped objects to orbs of light to flying saucers. Could the ubiquity of these sightings provide evidence of extraterrestrial visitation?

In the early 1900s, Edgar claimed to receive visions of both the past and the future while in a trance, he healed the sick, and alleged to have encounters with otherworldly beings. Could it be that he was a vessel used to carry out an alien agenda?

More than 3,000 years ago, the ancient Greeks credited their most monumental achievements to gods like Zeus, Apollo, and Poseidon. But is it possible that these powerful beings from Mt. Olympus were, in fact, extraterrestrial visitors to Earth?

In the 21st century, UFOs have gone from fringe science to mainstream obsession. UFO hunters are using incredible technology, and UFOs are being openly investigated. Are we closer than ever to understanding the strange events happening in our skies?

Talismans are seen as providing protection and good fortune. Some are even thought to embody a higher power. Could it be that what fuels our faith in talismans is not superstition, but a real connection to something beyond our world?

Counting down the top ten mysteries of the deep, from sunken continents to ruins on the ocean floor and even artifacts that may be remnants of Atlantis. Could these mysteries provide a record of extraterrestrial visitation?

Did a biblical patriarch receive instructions from 200 angels high above the earth? Were the ancient Greeks taught how to work metal by a race of fish-people? And might Egypt's most controversial pharoah have been an extraterrestrial being?

Ancient Astronaut Theorist Giorgio Tsoukalos takes a look back at The Top Ten Extraordinary Creatures we've investigated creatures that just might provide compelling evidence of extraterrestrial visitation.

Ancient Aliens is counting down the top ten locations around the world that might be hiding alien bases, including a cavern beneath the ice of Antarctica, a lake in China that is a hotspot for UFOs, and a pyramid under the slopes of Mt. Denali.

Ancient Aliens is counting down the top ten most devastating disasters ever documented that might have an otherworldly connection.

The ancient Sumerians established what is considered the world's first civilization, and they credited their extraordinary achievements to their gods, the Anunnaki.

For years, Scotland has been an epicentre of otherworldly phenomena. It is home to ancient stone circles, stories of strange beings and a major hotspot for UFO sightings. Could it be that Scotland is a magnet for extraterrestrial visitors?

There are mysterious ancient stones shaped into perfect spheres. Many of them show clear evidence of being manmade and some completely defy explanation. Could the mystery of the stone spheres provide clues about humankind's alien past?

During World War II, rumours spread that an aircraft had been built from extraterrestrial blueprints. Were aliens helping Hitler's quest for world domination?

Investigation into whether advanced technologies such as lasers and sonic weapons are merely rediscovered tools used by advanced beings in the past.

From a cave in Ecuador said to hold metal tablets containing alien knowledge, to an underground city in Turkey, these are the stories of supposed extraterrestrial lairs.

Biblical texts describe winged creatures carrying messages from the heavens. But are angels merely the product of the imagination - or do they really exist?

Could aliens have helped humans build huge ancient structures? Experts ask whether standing stones in Carnac, France, were a GPS system for ancient spacecraft.

Ruins in Peru support legends of a sunken UFO base, and Indian texts talk of water worlds populated by humans and aliens. Could aquatic cities prove that aliens visited?

'Ancient astronaut' theorists believe aliens have been visiting earth for thousands of years. If so, might we find evidence of this in the stories of America's Old West?

Hindu scripture describes an enormous flying creature called Garuda that shook the ground when it landed on Earth. Is it possible that this monster was actually a misinterpreted alien craft?

Are sacred places the product of man's reverence for gods, or the result of contact with ancient space travellers? Did man encounter divine beings at these holy places, or might they have met ancient extraterrestrials?

Could gold be the ultimate link between humans and aliens? A church in southern France is said to hold the key to alchemy - is it also a gateway to another part of the universe?

Throughout the world, ancient rites and rituals are believed to connect humans to another dimension. But just who - or what - are we communicating with?

Might the tools and technology of ancient builders have come from distant galaxies? If the ancient builders did use advanced technology, could it prove that aliens visited Earth thousands of years ago?

During the Black Death of the Middle Ages, people reported bronze flying ships emitting a strange mist. Scientist Richard Hoover published evidence of life in meteorites. Is it possible that ancient aliens have shaped human history?

Strange carvings suggest the Mayan city of Copan was ruled by the descendants of otherworldly beings. Are the astounding accomplishments of lost civilizations the products of ancient folklore or are they out of this world?

Gunpowder tearing apart human flesh and rockets destroying entire cities. Advances in technology have led to powerful weapons but were these the product of human innovation or created with help from another otherworldly source?

For thousands of years, there have been places around the world considered dangerous to humans. Could there be evidence that past extraterrestrial activity led to the negative energy in Earth's evil places?

What is the meaning behind secret messages found throughout Washington? Did America's Founding Fathers know something about ancient aliens that the general public did not?

Why are humans so different from every other species on Earth? Did we evolve from ape or is our intelligence the result of contact with an otherworldly source? Might evidence of alien contact help unlock the mystery of the Creation of Man?

Mass suicides. Human sacrifices. Unholy rituals. People have claimed to have otherworldly knowledge and have led followers to commit horrific acts of violence. Are they con men? Are they insane? Or are there extraterrestrials with a sinister agenda?

Megalithic monuments linked by electromagnetic energy. Prehistoric ruins arranged across distances in straight lines. Were ancient man's spectacular structures built by humans alone or do they bear evidence of design by other worldly visitors?

Zombies rising from their graves, blood sucking vampires damned for eternity and humans trapped in a struggle with hell. Are these beliefs manmade or extraterrestrial origins in earthly encounters with the undead?

How can ancient tombs across the world have so many remarkable similarities? Ancient Astronaut theorists believe that some of these tombs were designed with the help of extraterrestrials.

For thousands of years, human civilisation has been guided by the words and deeds of ancient prophets, but who were these prophets communicating with?

The gods worshipped by the Norse Vikings were fearsome and mysterious. Experts investigate whether these powerful Viking Gods could have been visitors from another planet.

All around the world, archaeologists have uncovered mysterious relics revered by ancient cultures for thousands of years. What is it about these ancient objects that draws people to them?

This episode examines new interpretations of ancient texts, which indicate that Satan may have been an extraterrestrial being, rather than an immortal force of evil.

Could the Anunnaki gods be more than legend? Is it possible that civilization made sudden, huge advances in development 5,000 years ago as a result of their presence on Earth?

Are crystal skulls an elaborate hoax? Or do they possess a great, perhaps even otherworldly power? This episode examines arguably the most controversial of ancient artefacts.

Reverence for the number three dates back thousands of years, and can still be found today in art, architecture, science, literature and religion. What is it about this number that continues to fascinate mankind?

Throughout the ancient world, magic was used for everything from healing to communicating with the gods. But did magic really exist in the ancient times as a means of replicating the power of the gods?

Stories of civilisations large and small disappearing without a trace can be found throughout history and across the globe.

The Civil War nearly destroyed the great experiment known as the United States of America, but is it possible that the preservation of the republic was influenced by extraterrestrial beings?

With infrared satellite technology detecting pyramids hidden underneath the sand in Egypt and airborne laser sensors discovering long lost pyramids beneath the jungles of Central America, many believe we have entered a new pyramid era.

Ancient Astronaut theorists have long proposed that extraterrestrials played a pivotal role in our past, and some believe they continue to keep a careful watch over the progress of mankind.

Humanoid robots are rapidly reaching a level of sophistication that was thought to exist only in science fiction. But is the obsession with creating counterfeit humans really pointing the way to mankind's future - or to its past?

Is it possible that an advanced civilization inhabited Earth thousands of years ago? Could the stories of a time when gods and otherworldly beings inhabited the planet be more than just mythology?

Did aerospace engineer Wernher von Braun have secrets collected by the Nazis in WWII, or access to technology recovered from Roswell? Is it possible that the world's greatest rocket scientist found his inspiration not on our world, but another?

In nearly every culture there are stories of opposing forces at work here on Earth - forces of a supernatural or otherworldly nature. Could these forces really exist? And if so, what is the true nature of the dark forces?

Since the launch of the Kepler Telescope in 2009, scientists have identified thousands of planets capable of supporting life. Is it possible that this discovery could finally answer the age-old question: are we alone in the universe?

In August of 2014, Russian cosmonauts aboard the International Space Station discovered something incredibly unexpected covering parts of the windows - living sea plankton. If sea life can thrive in space, might the reverse be true as well?

Ancient Aliens examines 75 million years of the most credible alien evidence here on Earth, from the age of the dinosaurs to ancient Egypt to the skies over the western desert in present day USA.

Chinese legends tell of a leader arriving on Earth on a flying dragon. Was it more likely a spacecraft? Some theorists believe that extraterrestrials not only interacted with us, but changed the course of history.

Strange evidence may exist in cultures throughout history suggesting that aliens came here to explore, excavate raw materials, experiment on human beings � and even for conquest.

If they visited, what did aliens leave behind? Indian Sanskrit texts dating back to 6000 BC describe flying machines called Vimanas. Plus, megalithic stone structures in Egypt reveal evidence of precision saw work.

Reports of encounters with strange beings and mysterious objects in the sky have occurred throughout history. Could these sightings the world over be evidence that aliens have been with us all along?

What would happen if aliens came calling? What protocols exist to determine who would speak on behalf of mankind, and how might we communicate? Some believe this has already happened.

Series examining 75 million years of the most credible alien evidence on Earth. Discover what secrets extraterrestrials may have left behind and how spacemen might have shaped our world.

Why do many cultures tell similar tales of monsters and giants? Could they be eye-witness accounts of extraterrestrials? Series examining evidence of aliens on Earth.

From Mexico's mystifying Zone of Silence to Markawasi Plateau in Peru, known for its frequent UFO sightings, were these the homes of ancient extraterrestrials?

Could aliens have told Joan of Arc how to beat the English army? And could a US serviceman have received a message when he touched a spaceship? Experts investigate.

Superhuman strength, supernatural powers and the ability to fly. If mythical gods really did exist, were they, as ancient astronaut theorists believe, extraterrestrial beings? Are these accounts tall tales, or could they be based on factual events?

The Nazca lines are hundreds of gigantic lines that extend for miles throughout a remote Peruvian desert. Could the massive markings have an alien connection?

Researchers explain how alien encounters are not a modern phenomenon, and ask if there could be an alien agenda behind the abduction of humans.

What compelled ancient man to move colossal stones to build remarkably similar stone monuments all around the world, from the jungles of Costa Rica to England�s countryside?

An examination of Erich von Daniken's controversial theories that have captured the attention of the world and ignited a movement known as Ancient Astronaut Theory.

Ancient emperors, kings and pharaohs were often attributed with otherworldly strengths, abilities and wisdom, and many were even considered gods by the people they ruled. Who were these exceptional leaders?

Accounts from various cultures describe similar divine, birdlike figures that brought advanced medical knowledge to mankind thousands of years ago. Who were these ancient surgeons?

Legends from around the world speak of sacred entryways to the land of the gods. Are such passages - or stargates - just inventions of myth, or did this interstellar travel exist in the ancient world?

The ancient Greeks, Egyptians and many other cultures have legends about exceptional children who are the offspring of humans and the gods. Could the stories be more than mere myth?

Is it possible that the world's greatest ancient relics are hidden on purpose - and protected by an extraterrestrial source?

Is our fascination with Mars simply because of its striking red color and prominence in the night sky? Or might we have a more profound extra-terrestrial connection?�

Throughout history, spiritual leaders known as shamans have healed, protected and advised their people. But are they simply putting on elaborate ceremonies?�

Can insects that have inhabited Earth for hundreds of millions of years provide a link to extra-terrestrial beings?

Demonic seduction, hybrid offspring and strange abductions. In cultures throughout the world, there are tales of intimate encounters with otherworldly beings. But could these stories be more than just mythology?

The Reptilian alien is a fixture of science-fiction, from HP Lovecraft's tales of Valusians to the Cardassians in Star Trek. Could ancient myths about reptilian creatures provide evidence that they are more than just a pop-culture creation?

From the beginning of recorded history there have been stories about beings with superhuman strength, super-sonic speed and supernatural abilities.�Is it possible that these stories are based on extra-terrestrial beings that once lived on Earth?

One of the most prolific inventors of the 20th century, Nikola Tesla shepherded mankind to a new industrial era and laid the groundwork for today's technological age. Is it possible that he was influenced by some otherworldly design?

Ancient Aliens explores the controversial theory that extra-terrestrials have visited Earth for millions of years.

It's been called the key to the universe and possibly the most important scientific breakthrough of all time. Could the so-called 'God Particle' reveal the truth about our origins?

Theorists offer compelling evidence suggesting that the ancient monolith thought to depict Egyptian pharaoh Khafra once represented an alien being.

Throughout history, incredible stories have been told of the dead rising from their graves, mummies journeying into the afterlife, and people on the brink of death mingling with deceased relatives in a celestial netherworld.

Could Earth's deepest caves hide secret conduits to other worlds? Or harbour evidence that aliens once visited our planet? Experts investigate.

Are we being watched by otherworldly beings? Experts make surprising discoveries as they explore the ancient past for evidence of alien overseers.

Whether it's Einstein's theory of relativity, Edison's light bulb, or Mendeleyev's Periodic Table of Elements, geniuses routinely say their best ideas come from dreams, visions, or hallucinated voices.

Ancient Astronaut theorists believe the global practice of mummification is not a coincidence, but proof that highly advanced extraterrestrials visited Earth in the distant past.�

There are those who believe that embedded in our most sacred religious texts, as well as in the design and location of ancient monuments, are secret messages that may reveal the purpose behind our very existence.�

It is a story told in more than twelve hundred cultures around the world: the gods sent a great flood to wipe out humanity for its disobedient and wicked ways.�

Ancient astronaut theorists have suggested that many of the divine beings depicted in cultures throughout the world are not really divine - or mythological - but instead reflect extraterrestrial visitations that our ancestors did not understand.

Russia is the home of 'cosmism', a belief that human civilisation originated in the cosmos and is destined to return to space. But many believe the rise of communism led to a wall of secrecy surrounding extraterrestrial contact in Russia.

Thousands of people from every part of the world have reported being abducted by aliens. Could the alien abduction phenomenon be true? If so, why are people being taken? And, more importantly, why are they being returned?

Of all the Hindu gods, none is more important than Shiva, the destroyer. Theorists suggest this being that possessed incredible weapons and supernatural abilities may have been an extraterrestrial leader who came to Earth with advanced technology.

Chile boasts the highest number of annual UFO sightings of any nation on Earth. Is there a connection to the more than 5,000 ancient geoglyphs found in the Atacama Desert?

From Egypt to Easter Island, towering figures built by ancient man stand watch over Earth. Are these stone giants simply a testament to humanity's past, or depictions of visitors from another world?

Shocking new evidence reveals that advanced civilisations might have existed on Earth tens of thousands of years ago. Is it possible that a technologically advanced society thrived on Earth then?

In numerous ancient cultures throughout the world, stories were told of ancestors that came to Earth from the Pleiades star cluster. Could new scientific findings reveal that humankind's true origins lie not on Earth... but 400 light years away?

When Spanish Conquistadors obliterated the historical record of the Maya in the 16th century, did they wipe out evidence that ancient people travelled to the Americas from all over the world in flying craft provided by extraterrestrial visitors?

Did ancient Druids travel to New England and New York's Hudson Valley centuries ago, bringing with them the beliefs and technologies of their alien mentors, the Shining Ones of Irish myth?

Serpent gods are found in the religious traditions of Mesopotamia, Central and South America, India, China and Japan. Even the Bible describes reptilian entities interacting with humans.

Are extraterrestrials altering human DNA and repopulating the Earth with alien/human hybrids? Follow the trail of evidence from ancient cultures to modern-day animal mutilations.

A mysterious mountain in northern Italy has stood witness to strange sightings in the sky and unexplainable phenomena for hundreds of years. Could its position on a powerful Earth energy line be attracting extraterrestrial visitors?

Could paranormal activity be explained by beings entering our world from other dimensions? According to some Ancient Astronaut theorists, entities that have been described as ghosts and angels are visitors from unseen realms.

The native Hawaiians trace their ancestry to beings from the Pleiades star system called the Akua. Could these islands have once been inhabited by extraterrestrials?

Throughout the ancient world, structures were built to mirror the constellations in the night sky--and, in most cases, this is only apparent when they are viewed from high above the Earth.

Ever since the first atomic bomb was detonated in 1945, UFOs have been reported at nuclear facilities all over the world. Is it possible that extraterrestrials are monitoring humanity's nuclear capabilities?

A shocking DNA study released in 2018 reveals that the original builders of Stonehenge mysteriously vanished. But where did they go?

Telepathy. Precognition. Psychokinesis. Is it possible that the human brain possesses extraordinary untapped abilities--given to us by extraterrestrial beings? Abilities that, once harnessed, will enable the next step in the evolution of humankind?

In ancient times, people spoke about divine substances that were consumed by the gods, and sometimes gifted to humans to impart great power, wisdom, and immortality. But could it be that the food of the gods was really sustenance for alien visitors?

Tattoos and piercings account for a billion-dollar industry. But are these practices being adopted by mainstream society as a form of self-expression, or is it motivated by a link to our ancestors?

Nestled within a remote valley in Utah is a ranch that some believe is a hotbed of strange, inexplicable phenomena. Could the bizarre activity have a connection to an alien entity known as the Skinwalker?

In 2019, millions responded to an internet post advocating to storm the gates of the world's most top-secret military installation - Area 51.

Over the past 20 years, thousands of potentially habitable exoplanets have been discovered outside our solar system. Could some be home to intelligent extraterrestrial life? Perhaps even alien beings that have visited Earth?

Giorgio Tsoukalos and David Childress explore the mysterious chain of manmade islets in Micronesia's Nan Madol, built from 250 million tons of volcanic rock, Might the site's powerful magnetic anomalies be the result of extraterrestrial technology?

Are governments around the world preparing mankind for the most startling event in human history: the official disclosure of an extraterrestrial presence on Earth? And if so, why is this occurring now, and what might happen in its aftermath?

From Egypt to Easter Island, towering figures built by ancient man stand watch over Earth. Are these stone giants simply a testament to humanity's past, or depictions of visitors from another world?

Shocking new evidence reveals that advanced civilisations might have existed on Earth tens of thousands of years ago. Is it possible that a technologically advanced society thrived on Earth then?

Rebellious angels, giant hybrid beings and humans taken up to a heavenly realm above the Earth. Is it possible that the Book of Enoch was stricken from the Bible because it documents humanity's extraterrestrial origins?

From Egypt to Easter Island, towering figures built by ancient man stand watch over Earth. Are these stone giants simply a testament to humanity's past, or depictions of visitors from another world?

Shocking new evidence reveals that advanced civilisations might have existed on Earth tens of thousands of years ago. Is it possible that a technologically advanced society thrived on Earth then?

A mysterious mountain in northern Italy has stood witness to strange sightings in the sky and unexplainable phenomena for hundreds of years. Could its position on a powerful Earth energy line be attracting extraterrestrial visitors?

Rebellious angels, giant hybrid beings and humans taken up to a heavenly realm above the Earth. Is it possible that the Book of Enoch was stricken from the Bible because it documents humanity's extraterrestrial origins?

A shocking DNA study released in 2018 reveals that the original builders of Stonehenge mysteriously vanished. But where did they go?

It is humankind's most profound achievement: blasting off into the stars. But is it possible that our voyages into the cosmos are really a return to our true origins? And if so, will we encounter space travellers from other worlds?

In the 20th century, pioneering scientists, journalists and investigators defied convention and began documenting UFOs. Now, with new UFO accounts coming to light, will their work finally culminate in undeniable proof of extraterrestrial visitation?

Tattoos and piercings account for a billion-dollar industry. But are these practices being adopted by mainstream society as a form of self-expression, or is it motivated by a link to our ancestors?

Nestled within a remote valley in Utah is a ranch that some believe is a hotbed of strange, inexplicable phenomena. Could the bizarre activity have a connection to an alien entity known as the Skinwalker?

In 2019, millions responded to an internet post advocating to storm the gates of the world's most top-secret military installation - Area 51.

Over the past 20 years, thousands of potentially habitable exoplanets have been discovered outside our solar system. Could some be home to intelligent extraterrestrial life? Perhaps even alien beings that have visited Earth?

Giorgio Tsoukalos and David Childress explore the mysterious chain of manmade islets in Micronesia's Nan Madol, built from 250 million tons of volcanic rock, Might the site's powerful magnetic anomalies be the result of extraterrestrial technology?

Are governments around the world preparing mankind for the most startling event in human history: the official disclosure of an extraterrestrial presence on Earth? And if so, why is this occurring now, and what might happen in its aftermath?

In 1947 the U.S. military collected the debris of what they claimed was a crashed weather balloon outside of Roswell, New Mexico. But could new evidence prove the conspiracy theorists right?

In 2021, the United States government broke a 70-year precedent of denying UFOs. Will we soon discover that they are, in fact, of extraterrestrial origin?

It is one of the greatest mysteries of the prehistoric world: why did people on nearly every continent erect giant standing stones?

Some of the world's most iconic sacred temples were built atop the ruins of structures that are far more ancient. What compelled early humans to rebuild in the same places again and again?

Across the globe, high-ranking government officials are openly talking about Unidentified Aerial Phenomena. But why now? Ancient Astronaut theorists suggest the truth about an extraterrestrial presence on Earth will soon be revealed.

The most sacred relic of the ancient world: The Ark of the Covenant. Could descriptions of the Ark's incredible power reveal that it was a highly advanced technological device?

In the traditions of native peoples across North America are stories of the Star Ancestors: powerful beings who descended to Earth in the distant past and are sometimes present even today.

Since 2017, the Navy has been releasing photos and videos of Unidentified Aerial Phenomena, and Ancient Astronaut Theorists suggest the incredible images are nearly identical to accounts from centuries ago.

Millions of people around the world have reported encountering shadowy entities who instill fear, shortness of breath, and even paralysis. Is it possible that the so-called "Shadow People" are more than mere figments of the imagination?

Throughout the ancient world, tales were told of fire-breathing dragons. Is it possible that what our ancestors described as winged monsters descending from the sky were visitors from other worlds?

Today, more people than ever before believe that UFOs are of alien origin. But if extraterrestrials have come to Earth from lightyears away, could they be capable of bending both time and space?

Giorgio Tsoukalos takes a look back at the most extraordinary encounters that, as far as he's concerned, provide evidence of an extraterrestrial presence on Earth.

Giorgio Tsoukalos takes a look back at some of the most incredible structures we've visited all over the world. Structures that, as far as Giorgio is concerned, provide undeniable evidence of extraterrestrial contact.

In Ireland, the notion of the fairy folk dates back thousands of years and originates with stories of powerful shining beings who came down from the sky. Could these tales have been inspired by ancient alien visitation?

Ancient cultures around the world often referred to the gods as the "Immortals" - but could they have encountered extraterrestrial beings that had achieved eternal life?

In the 20th century, a mysterious British woman who claimed to be the reincarnation of an Egyptian priestess shocked Egyptologists by accurately locating artefacts in the Nile Valley. Was she carrying out an otherworldly agenda?

In the nearly 2,000-year-old text called 'The Zohar' there is a curious passage that describes seven Earths - each of which is said to be populated by both human and non-human intelligences.

Examining 75 million years of the most credible alien evidence here on Earth, from the age of the dinosaurs to ancient Egypt to the skies over the western desert in the present day.

Ancient Aliens is counting down the top ten scariest encounters that just might be evidence of extraterrestrial visitation. From an encounter in rural Texas that left onlookers with unexplainable injuries, to mysterious cattle mutilations.

Counting down 10 intriguing symbols and codes found across the globe that might contain proof of otherworldly contact.

Along the Earth's north 37th parallel there have been so many reports of UFO's and other mysterious events that it has been dubbed The UFO Superhighway. Could there be something about this latitude that is attracting extraterrestrial visitors?