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UFO Warehouse: Experts claim that UFO wreckage is stored in a top-secret facility in Ohio. Former employees spin a tale of alien bodies and flying saucer debris.

Throughout time, people have believed mountains were the home of the divine. But could these hilltop spirits have been extraterrestrials.

Scholars identify Egypt's obelisks as monuments to the pharaohs, while ancient astronaut theorists suggest they may power communication with the gods.

Alice is in Lincoln, getting to grips with life in medieval England. She visits the magnificent cathedral that was once the tallest building in the world.

In 1969, an unidentified killer taunted investigators with cryptic ciphers. Explore six theories that could help solve this 50-year-old mystery.

In 2012, Italian divers discovered the wreck of the biggest aircraft in WWII, Messerschmidt Gigant, off the coast of Sardinia. This film explores the search for the wreckage.

Experts examine beliefs that a French church provides a gateway to another universe. Plus, could the Sphinx be built on a library left by aliens.

Ancient Astronaut theorists explore the idea that meteorites could be pieces of extraterrestrial technology.

Chart the development of the original form of combat - melee. Over time, short range instruments of battle have evolved, from the short sword to Exoskeletons.

The horrific story of one of the longest sieges in military history, told from the Russian perspective. More than a million citizens lost their lives.

In 1974, the US government was tracking a UFO when it disappeared over Coyame, Mexico. At the same time, a civilian plane crashed. Why was it all covered up.

For centuries, the myth of El Dorado has attracted treasure hunters to the Andes in search of gold. Here, see the real - and at times brutal - story behind the legend.

Last Stand in the Holy Land: The investigation into the Knights Templar takes the team to the ancient city of Acre.

More than 80% of the Earth's oceans remain unexplored, and in many ways, the underwater world is the final frontier.

In 1592, Elizabeth I visited Sudeley Castle where a spectacular garden was created. 500 hundred years later, a team of archaeologists hunt for this lost gem.

Alice Roberts explores Georgian Edinburgh's finest architecture, the roots of modern Scottishness, and some dark imperial controversies.

A walk through the iconic mausoleum complex, located in India and commissioned in 1632 by the Mughal emperor Shah Jahan to house the remains of his beloved wife.

The Mad King of Bavaria: Explore the controversy surrounding the death of the eccentric King Ludwig, whose unstable behaviour saw him deposed.

Explore how Romania, Bulgaria, Hungary and the Baltic states came to be "Judenfrei" - meaning free of Jews - as a result of Nazi Death Squads in December 1941. (2 of.