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Experts scrutinise the Maya Calendar, which predicted the world would end in 2012. Could it have anticipated the arrival of an extraterrestrial god.

Many are convinced extraterrestrials roam among humans - and believe their intentions can be terrifying.

Unravel clues to Maya political intrigue in Guatemala and see why footprints found post-storm are changing English migration history.

Russian designer Nikolay decided to engineer a solution to trench warfare with an armoured vehicle with wheels that could move over any terrain.

Discover the true story of a German Luftwaffe pilot in World War II who risked his own life to save the crew of an American B-17 bomber.

A change in location gives Ian a head start in his quest to take his custom metal work to brand-new heights.

Journey to an Indian village where men train to become bouncers in the big city. Elsewhere, take a tour of the Chinese settlement where fire erupts from the ground.

In the northwestern Pacific, a tourist stumbles across a mysterious structure. Elsewhere, an unsettling sight is revealed on the island of New Guinea.

A young boy makes international headlines when he uses satellite images to discover lost cities of the Maya and trees in China seem to be spelling out a sinister message.

On June 10, 1942, Major Georges Bergé's team landed in Crete to destroy Luftwaffe planes at Heraklion airfield. They faced a tough mission.

Ten British commandos, led by Major Hasler, leave the submarine Junon to paddle to Bordeaux and sabotage German warships.

Thousands of UFO sightings are reported in the United States every year and intriguingly many of them centre around US military operations.

Could ancient rulers have had otherworldly links? Experts examine whether history's most powerful leaders were 'chosen' and guided by aliens.

Alice tells the story of Roman Britain by studying the history of Chester. She enjoys an authentic Roman feast and checks out an archaeological discovery. (1 of.

An awe-inspiring year of archaeological digs with Dr Alice Roberts. Roman finds include an amazing coin hoard and a man buried on a pile of dead animals.

Journey to an Indian village where men train to become bouncers in the big city. Elsewhere, take a tour of the Chinese settlement where fire erupts from the ground.

In the northwestern Pacific, a tourist stumbles across a mysterious structure. Elsewhere, an unsettling sight is revealed on the island of New Guinea.

A young boy makes international headlines when he uses satellite images to discover lost cities of the Maya and trees in China seem to be spelling out a sinister message.

On June 10, 1942, Major Georges Bergé's team landed in Crete to destroy Luftwaffe planes at Heraklion airfield. They faced a tough mission.

Ten British commandos, led by Major Hasler, leave the submarine Junon to paddle to Bordeaux and sabotage German warships.

Leopard on the Loose, Plummeting to Earth, Elephant Attack & Balloon Chaos: A leopard goes on a rampage, a paraglider plummets to earth and a woman gets too close to an elephant.

Sonar reveals a potential wreck, but a cryptic clue suggests an even greater discovery hidden beneath the waves.

Thousands of UFO sightings are reported in the United States every year and intriguingly many of them centre around US military operations.