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Serpent gods are found in many religious texts. Could these stories be describing reptile-like extraterrestrials? And are they still here today.

The team head to Mexico to the site of an alleged international incident involving the remains of a UFO wreck.

As Alex Langlands examines the unique properties of the stones of Stonehenge, Helen Skelton visits the nearby village where its builders lived.

Rick and Beau embark on an epic search through the River Ouse in Yorkshire, in a bid to find evidence of Viking life.

Ton and Allen jet to the Hawaiian islands where they're joined by a new assistant. The team uncover a pair of James Bond-style gadgets and a vintage sledge.

Allen and Ton and their friends battle local buyers. The guys find a WWII-era motor scooter and a stash of antique Polynesian tattoo tools.

Discover some of history's most effective and deceptive lightning strikes, achieving victory through speed, precision and the element of surprise.

From a man who frees himself all thanks to a stone fruit, to a Soviet pilot who evades capture by stealing the enemy's plane.

The Jericho Head, the Cloudbuster and the Map: Examine a 9,000-year-old clay head, a 1950s machine built to control the weather and a map which could be the oldest ever found.

Discover an island the size of Manhattan that vanishes without a trace and a lost city in the heart of the Amazonian jungle.

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.

Weapons designed for everyone hand a sizeable advantage. Experts explore three weapons that are easily used: the crossbow, a pike and the Kalashnikov.

Is our planet prepared for an extraterrestrial invasion of disease? And could past plagues have been brought to Earth by aliens? Experts investigate.

Experts explore animal mutilations and alien abductions as they ask whether extraterrestrials could be altering human DNA.

The UFO Hunters travel to Stephenville, Texas to investigate multiple reports of strange lights in the sky.

Helen Skelton and Alex Langlands venture to Lindisfarne and the Isle of Man to unearth the secrets of Viking burial grounds.

The River Hunters head to the River Lochy in search for evidence of the clashing Scottish clans embroiled in the 17th Century civil war.

From a man who frees himself all thanks to a stone fruit, to a Soviet pilot who evades capture by stealing the enemy's plane.

The Jericho Head, the Cloudbuster and the Map: Examine a 9,000-year-old clay head, a 1950s machine built to control the weather and a map which could be the oldest ever found.

Discover an island the size of Manhattan that vanishes without a trace and a lost city in the heart of the Amazonian jungle.

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.

Weapons designed for everyone hand a sizeable advantage. Experts explore three weapons that are easily used: the crossbow, a pike and the Kalashnikov.

Yale's Skull & Bones society is a pinnacle of the elite. But how do members get 'tapped' and is there any truth to the rumours surrounding this secret order.

In the battle between truth and lies, money plays a decisive role. Nothing seems to be safe from the power of money and the influence of those who possess it.

Is our planet prepared for an extraterrestrial invasion of disease? And could past plagues have been brought to Earth by aliens? Experts investigate.