A massive landslide chases a group of construction workers. A tornado tears through an airport and an earthquake threatens a 700-year-old church. Mother Nature continues her killing spree.

Investigators try to compile and analyze evidence to prove that the elusive monster known as sasquatch exists, including videos, tracks, prints and maps of sightings.

Warriors

In 1565, the Knights of Saint John defended Malta from the attacking Ottomans. Terry Schappert reveals what it was like to be a warrior in one history's greatest sieges.

The team heads to Colorado Springs to search for the remains of Nikola Tesla's mysterious laboratory and attempt to prove that Tesla's design for generating wireless electricity actually works.

...and the Greek Pot of Gold: Michael Steinhardt, the largest private collector of antiquities, is forced to turn over $70 million dollars� worth of stolen loot and banned from collecting. His undoing comes after a four-year investigation known as Operation Demetra.

Engineering Disasters

An explosion in a San Bruno, California destroys homes and kills residents. An experienced captain and crew sail their ship into the path of Hurricane Sandy, leaving many asking why. Was it an engineering failure or human error?

There's a growing phenomenon of alleged UFO sightings known as 'Orbs'. Witnesses who see the orbs also report having dreams, premonitions and a deep fear.

Holding off invasion and protecting its people, ancient civilisations came up with effective means of self-protection and defense. Walk the grounds of the castle that helped create Great Britain and learn why it was such an impregnable fortress.

A massive landslide chases a group of construction workers. A tornado tears through an airport and an earthquake threatens a 700-year-old church. Mother Nature continues her killing spree.

Investigators try to compile and analyze evidence to prove that the elusive monster known as sasquatch exists, including videos, tracks, prints and maps of sightings.

Warriors

In 1565, the Knights of Saint John defended Malta from the attacking Ottomans. Terry Schappert reveals what it was like to be a warrior in one history's greatest sieges.

The team heads to Colorado Springs to search for the remains of Nikola Tesla's mysterious laboratory and attempt to prove that Tesla's design for generating wireless electricity actually works.

...and the Greek Pot of Gold: Michael Steinhardt, the largest private collector of antiquities, is forced to turn over $70 million dollars� worth of stolen loot and banned from collecting. His undoing comes after a four-year investigation known as Operation Demetra.

Engineering Disasters

An explosion in a San Bruno, California destroys homes and kills residents. An experienced captain and crew sail their ship into the path of Hurricane Sandy, leaving many asking why. Was it an engineering failure or human error?

There's a growing phenomenon of alleged UFO sightings known as 'Orbs'. Witnesses who see the orbs also report having dreams, premonitions and a deep fear.

Holding off invasion and protecting its people, ancient civilisations came up with effective means of self-protection and defense. Walk the grounds of the castle that helped create Great Britain and learn why it was such an impregnable fortress.

A massive landslide chases a group of construction workers. A tornado tears through an airport and an earthquake threatens a 700-year-old church. Mother Nature continues her killing spree.

Investigators try to compile and analyze evidence to prove that the elusive monster known as sasquatch exists, including videos, tracks, prints and maps of sightings.

Warriors

In 1565, the Knights of Saint John defended Malta from the attacking Ottomans. Terry Schappert reveals what it was like to be a warrior in one history's greatest sieges.

The team heads to Colorado Springs to search for the remains of Nikola Tesla's mysterious laboratory and attempt to prove that Tesla's design for generating wireless electricity actually works.

...and the Greek Pot of Gold: Michael Steinhardt, the largest private collector of antiquities, is forced to turn over $70 million dollars� worth of stolen loot and banned from collecting. His undoing comes after a four-year investigation known as Operation Demetra.

Engineering Disasters

An explosion in a San Bruno, California destroys homes and kills residents. An experienced captain and crew sail their ship into the path of Hurricane Sandy, leaving many asking why. Was it an engineering failure or human error?

Looting History

A tiny fragment of papyrus worth more than its weight in gold is the beginning of the end for superstar Oxford don Dirk Obbink. It’s the latest chapter in the pillage of Ancient Egypt, where looting is a way of life.

Unidentified: Inside America's UFO Investigation

Former U.S. government insiders brought together by rock star Tom DeLonge team up to reveal what the government knows about UFOs.

At the end of the 13th century, Scotland was a country under attack. Defeat seemed inevitable. But from nowhere emerged a man who became Scotland's greatest hero - William Wallace, commonly known as Braveheart.

Awesome analogies bring the biggest objects, farthest distances and fastest speeds down to earth. To truly understand the scale of the cosmos, we jump behind the wheel of monster trucks and scale the Golden Gate bridge.

Ancient Aliens

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?

Life After People

Water gives life, but it can also destroy. Rain will flood New Orleans, and when power goes out in the city's aquarium, it spells doom for thousands of animals.

Experts investigate the alleged crash of an alien craft in Texas in 1897, debris of which was reportedly thrown down a well while an alien body was buried in a local graveyard.