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In the Mojave Desert, there is a structure built to bestow everlasting life, and according to the architect, its blueprint is from another world.

Accounts of creatures that can shapeshift from one form to another can be found throughout history. But are they real and do they have otherworldly origins.

A silent football-shaped object causes grave concern when it's spotted in Maine in 1975. In 1946, a UFO crashes and causes a deafening explosion as it crashes in northern Sweden.

In Brazil, three men escape a close encounter. In Canada, a thirteen-year-old boy is blinded temporally after investigating a bizarre object.

Dr Alice Roberts visits excavations in Orkney and York on the hunt for Viking relics. Finds include an amazing collection of silver and gold.

Andy explores Wiltshire's mysterious megaliths and barrows, visits a medieval meadery and encounters a religious pilgrimage at the site of a freshly made crop circle.

Ton and Allen face their toughest challenge yet when two old rivals join forces. The guys dig up an off-road motorcycle and a pair of net guns.

Allen heads to an auction with Elle, while Ton and Big Sis revamp the shop to help bring in more customers. Allen unearths a Ouija board.

Exploring the machines that hide in the shadows, capturing, transmitting and analysing vital combat information.

From massive asteroids and bursts of radiation, are we prepared for the calamity that may be coming our way.

A giant naval vessel is located on the bottom of the Norwegian Sea, while an ancient reptile-like creature is found in Canada.

Strange black holes appear near Egypt's ancient pyramids and a mysterious red swarm invades a beach in India.

In our final episode, we examine how each Axis Power had troubles on their own home front, leading to disaster in the final days of the war.

During WWII, soldiers from the British Empire, Belgium and France tried to evacuate from the town of Dunkirk during a arduous battle with German forces. This film explores the story.

The White House has consistently denied any knowledge of aliens, but is it in fact possible that extraterrestrials have been influencing presidents.

Do the reported discoveries of towering, human-like skeletons reveal that the world was once inhabited by giants.

An Australian banana farmer spots a saucer-shaped UFO rising out of a swamp in 1966. That same year in Victoria, a man veers off the road while distracted by lights in the sky.

A father and son see mysterious lights near their property and call the sheriff's office. A large craft covers a French town in an odd material.

Dr Alice Roberts discovers what Britain was like before the Romans as she examines fascinating finds from the Bronze and Iron Ages.

Andy receives military training at a Civil War re-enactment, before embarking on a ghostly hunt and meeting the man who captured leopard DNA from a sheep kill.

From massive asteroids and bursts of radiation, are we prepared for the calamity that may be coming our way.

A giant naval vessel is located on the bottom of the Norwegian Sea, while an ancient reptile-like creature is found in Canada.

Strange black holes appear near Egypt's ancient pyramids and a mysterious red swarm invades a beach in India.

In our final episode, we examine how each Axis Power had troubles on their own home front, leading to disaster in the final days of the war.

During WWII, soldiers from the British Empire, Belgium and France tried to evacuate from the town of Dunkirk during a arduous battle with German forces. This film explores the story.

Thieves tunnel into the vault of a Lloyds Bank branch in London. A radio enthusiast intercepts their chatter, leading to a game of cat and mouse.

After 27 months of planning, an elite crew of Italian thieves execute their ambitious and intricate plan to make off with more than $100 million.

The White House has consistently denied any knowledge of aliens, but is it in fact possible that extraterrestrials have been influencing presidents.