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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.

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

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.

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.

Do India's Sanskrit texts, with their descriptions of advanced technology, lend themselves to the theory that aliens once walked amongst us.

Going by ancient cultures' depictions of gods appearing as animals, could it be that extraterrestrials bear more resemblance to animals than humans.

The team has secret intel on a wreckage that could be the legendary yacht 'Ingomar', whose 1930s disappearance raises many questions.

Discover unidentified objects witnessed by military pilots and a potential alien home in the darkness of space.

The team heads into Midwestern forests to investigate werewolf sightings, recently uncovered film footage and new witnesses.

Do India's Sanskrit texts, with their descriptions of advanced technology, lend themselves to the theory that aliens once walked amongst us.

Going by ancient cultures' depictions of gods appearing as animals, could it be that extraterrestrials bear more resemblance to animals than humans.

The Titanic's tragic story captures the imagination of the public and experts of all kinds, who still seek answers after more than 100 years.

The Legend of the Lost Dutchman's Mine: The search for the most famous gold mine in the Old West has seen many perish in the pursuit of its elusive riches.

Five years after John F Kennedy is killed by gunshot, his brother Robert meets the same fate - and the clues are riddled with inconsistencies.

A tragedy leads to one of the darkest chapters in early American history, as fear rips through the small town of Salem, Massachusetts.

The Lost Fortune of the Knights Templar: Discover what happened to the secret hoard of the Knights Templar - containing gold, silver and relics protected by a religious order.

Troy Landry chases legendary treasure hidden deep in the bayou, helped by his right-hand man Pickle Wheat and veteran hunter Don Brewer.

Giorgio Tsoukalos draws on evidence from past series as he takes an in-depth look at the mystery of Southern Peru's Nasca Lines.

After the attack on Pearl Harbor, the Japanese army celebrated its victory. Four months later, the Battle of the Coral Sea shakes their confidence.

Man Stalked By Cougars, When Planes Collide, Buried Alive & Terrifying Drive: Skydivers narrowly escape two colliding planes, a father and son drive through a wildfire and more.

Snowmobile, The Real 6 Million Dollar Man Crash, When Tires Attack and Train Track: Chaos ensues when the wheels literally come off a vehicle going full speed.

Do India's Sanskrit texts, with their descriptions of advanced technology, lend themselves to the theory that aliens once walked amongst us.