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Theorists investigate a depiction of a stegosaurus found at Angkor Wat in Cambodia. Could it suggest that alien species killed off the dinosaurs.

No one knows who designed and built Bolivia's sophisticated temple complex. Could it have been aliens? Experts investigate.

Witness the dark origin stories behind some of history's most notorious methods of execution, from the guillotine to the electric chair.

Fish remains found near an angry Sumatran volcano could suggest a new human migration route and a collapsed kingdom in Turkey gets discovered.

Uncover some of the world's most renowned encryptions, revealing how they were decoded, the minds who cracked them and the secrets they masked.

An Air Force Police Officer sees a strange aircraft near a shimmering light before developing skin cancer. Were the events related? Later, a staff sergeant sees a shadowy figure.

Ian shakes things up by taking on a custom vintage vehicle project for a Hollywood picture car coordinator.

Visit the plastic bottle village in Panama, discover floating boats in Greece, take a journey to Chernobyl and investigate the impact of the Centralia mine fire in Pennsylvania.

Troy's grandsons report strange bites on their legs while swimming. Concerned, Troy investigates, enlisting the help of his friend, to track down the culprit.

Strange markings could be a coded message with a plot to overthrow the Queen of England and a lake with healing powers holds clues to life on Mars.

The USS Enterprise became the first ship to receive the Presidential Unit Citation in WWII, following its mission during the bloody Gilbert invasion.

A chronological telling of the dramatic D-Day story, focusing on the vessels that made the landings possible.

The Top Ten Mysteries of the Deep: Count down the top ten mysteries of the deep, from sunken continents to supposed proof of the lost city of Atlantis.

Explore whether the Gods of Greece including Zeus, Apollo and Poseidon, were actually extra-terrestrial visitors to Earth.

Every day, all around the world, in the most ordinary places, regular people are spotting UFOs.

Alice explores the stories of England's 'Golden Age', from Sir Francis Drake to the Spanish Armada, piracy, theft, and the slave trade.

Hugh and the team attempt to uncover a Roman fort, connected to Hadrian's Wall, that's buried beneath the back gardens of Benwell in Newcastle.

Visit the plastic bottle village in Panama, discover floating boats in Greece, take a journey to Chernobyl and investigate the impact of the Centralia mine fire in Pennsylvania.

Troy's grandsons report strange bites on their legs while swimming. Concerned, Troy investigates, enlisting the help of his friend, to track down the culprit.

Strange markings could be a coded message with a plot to overthrow the Queen of England and a lake with healing powers holds clues to life on Mars.

The USS Enterprise became the first ship to receive the Presidential Unit Citation in WWII, following its mission during the bloody Gilbert invasion.

A chronological telling of the dramatic D-Day story, focusing on the vessels that made the landings possible.

Pythons in the Ceiling, Train Tunnel Escape, Suspicious Plane Crash & Russian Concord Crash: A man seeking his 15 minutes of internet fame crashes his plane into a forest.

Into the Eye of the Storm: Jeff MacKinnon's team battles thick kelp, brutal currents and a looming storm while searching Scatarie Island's coast.

The Top Ten Mysteries of the Deep: Count down the top ten mysteries of the deep, from sunken continents to supposed proof of the lost city of Atlantis.