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.

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.

Astronomical events were once thought of as heralds of ill omen. But what could these events have been? And did any of them shape history?

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.

Astronomical events were once thought of as heralds of ill omen. But what could these events have been? And did any of them shape history?

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.

Astronomical events were once thought of as heralds of ill omen. But what could these events have been? And did any of them shape history?

Looting History

Customs officials in Memphis find looted antiquities in a shipment labeled "tile samples." A chase across continents leads to Muslim extremists in Iraq. The Green family is impacted by the scandal.

A former U.S. Navy radar operator emerges from the shadows to reveal the terrifying day it rained UFOs. U.S. Navy personnel unveil new details including an explanation of why UFOs are sighted over oceans

From the truth behind the Olympic stadium to the Triumphal Arch, we uncover Hitler's ideal Germany.

What does the Universe sound like? From the sweep of a pulsar, to the deafening roar of our boiling sun, this episode explores the undiscovered soundscapes of the solar system, the galaxy, and the entire cosmos.

Ancient Aliens

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.

The Universe

Imagine a tornado so powerful it can form a planet, rain made of iron and 6,000mph winds.

Homer's The Odyssey is the most famous epic ever written. But could it have actually happened? Astronomical clues and recent geological data now suggest evidence with direct links to the story of Odysseus.

Do texts other than the Bible reinforce the idea of Eden? Both the Babylonian Epic of Gilgamesh and Ancient Greek texts speak of a paradise lost. We'll sift through the evidence to decode an age old mystery.

Looting History

Customs officials in Memphis find looted antiquities in a shipment labeled "tile samples." A chase across continents leads to Muslim extremists in Iraq. The Green family is impacted by the scandal.

A former U.S. Navy radar operator emerges from the shadows to reveal the terrifying day it rained UFOs. U.S. Navy personnel unveil new details including an explanation of why UFOs are sighted over oceans

From the truth behind the Olympic stadium to the Triumphal Arch, we uncover Hitler's ideal Germany.