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During Italy's reconquest, the Allies faced the Winter Line and called in the First Special Service Force, elite troops trained for brutal terrain warfare.

The ancient metropolis of Teotihuacan, called The City of The Gods by the Aztecs, is a site of great mystery. Could alien beings have once lived there.

Different cultures have used mantras and chanting for thousands of years - could these in fact be a method of communing with extraterrestrial forces.

The team analyses incredible NASA footage of reported UFOs, and interviews former NASA employees who allegedly witnessed cover ups first hand.

After humanity ceases to exist, the homes built, ranging from mansions to rural farmhouses, face relentless siege by fire, flood, wildlife and time.

When humanity vanishes, the vast infrastructure underground, from subways and pipelines in the United States, begins to unravel.

In a world without humans, water turns from life-giver to destroyer, flooding cities, collapsing dams and triggering ancient forces long kept at bay.

When humanity disappears, the global retail machine collapses. Malls rot and grocery stores become battlefields for rodents.

Did a top secret group of officials, dubbed the Majestic Twelve, really create a space programme that has already established bases on the moon.

Experts question if Cloud computing represents the rediscovery of an ancient repository of knowledge known as the Akashic Record.

Are modern pirates prowling the Bermuda Triangle in search of victims? The team investigates the case of a luxury boat lost in 1974.

History's most acclaimed prophet, Nostradamus, saw the arrival of three Antichrists that would plague mankind. But who are they.

The team investigates reports of aggressive and territorial packs of sasquatch in the Sierra Nevada Mountains.

Did a top secret group of officials, dubbed the Majestic Twelve, really create a space programme that has already established bases on the moon.

Experts question if Cloud computing represents the rediscovery of an ancient repository of knowledge known as the Akashic Record.

The Sleeping Prophet: In the 1900s, a modern-day prophet Edgar Cayce became a worldwide sensation. He claimed to receive visions of both the past and future.

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.

In the 21st century, UFOs have gone from fringe science to mainstream obsession. Are we getting closer to understanding the strange events in the sky.

For millennia, people have believed that everyday objects can possess hidden energy. These talismans are seen to provide protection and good fortune.

The King of the Swamp investigates disturbing phenomena in a malevolent section of a swamp home to strange creatures.

UFOs: The team examine incidents of alleged conflicts between the US Air Force and the RAF, and asking whether these encounters have been covered up.

By June 1941, Hitler controlled most of Europe, but the USSR resisted invasion. Then Pearl Harbor changed everything.

Meet the women who took Hitler under their wing, training him in the methods of high society and power - only to be left behind once he achieved it.

With Roman rulers now at the mercy of the barbarians, three Roman generals compete to become emperor - but one's savage strategy comes out on top.

Did a top secret group of officials, dubbed the Majestic Twelve, really create a space programme that has already established bases on the moon.