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Prophets & Prophecies: Did prophets such as Elijah and Joseph Smith communicate with a heavenly source or did they actually come into contact with extraterrestrials? (S5, ep 2)

Beyond Nazca: Ancient alien theorists explore the mysterious phenomena of the Nazca Lines. Could these huge geoglyphs in Southern Peru have an extraterrestrial connection? (S5, ep 3)

Temples of Doom: From the terrifying Tower of London to a hotel of horrors, discover the dark secrets hidden within these foreboding fortresses. (S1, ep 2)

Heinrich Himmler: An agriculturalist by trade, he went on to lead the SS and tried to escape responsibility at the end of the war. Who was Heinrich Himmler? (S1, ep 2)

The Killer Code: The Zodiac Killer Code reveals the desperate bid to crack the crazed codes sent by America's most mysterious serial killer. (S1, ep 2)

US Navy Seaman Jesse Castillo sees a boy appear and disappear in Italy, while Military Police Officer Auburn White finds herself levitating after falling asleep. (S1, ep 2)

An Elephant in an Ice Rink: The time has come for Ian to leap into one of his biggest ever projects with the intention of helping a friend. (S6, ep 5)

The Disappeared: New theories shed light on the world's biggest mysteries, including the unsolved disappearances of aviator Amelia Earhart and hijacker DB Cooper. (S1, ep 1)

Dead Zone: A suspicious disappearance in Troy's backyard sends the King of the Swamp deep into the bayou to confront beasts known and unknown. (S2, ep 2)

A ghost ship is found abandoned on a remote island that's home to one of the world's last uncontacted tribes. (S4, ep 19)

Greece: In 1944, 28 Greek socialists were shot in Syntagma Square and 100,000 had perished by the end of the Civil War. Was this the old order Winston Churchill had longed for? (S2, ep 1)

The Smallest Ships of War: Ships don't have to be large to make history, like the 1776 gunboat built to stop a British invasion, or the remarkable story of the HA-19 sub. (S1, ep 8)

Secrets of the Sumerians: When the ancient Sumerians built their civilisation, they credited their gods - but were these powerful beings actually extraterrestrial visitors? (S16, ep 7)

Mysteries of Scotland: Home to mysterious stone circles, stories of strange beings and reported sightings, Scotland has always been an epicentre of otherworldly phenomena. (S16, ep 8)

Sometimes, the mysterious unidentified objects people see in the sky touch down and leave physical evidence behind. (S1, ep 6)

Tower of London: Dan delves into the rich past of the Tower of London, exploring inside the imposing walls that have witnessed some of the most important events in our history. (S1, ep 2)

Falkirk: Hugh and the experts attempt to uncover a lost Roman fort connected to the Antonine Wall, buried beneath the gardens of the quiet streets of Falkirk. (S2, ep 1)

The Disappeared: New theories shed light on the world's biggest mysteries, including the unsolved disappearances of aviator Amelia Earhart and hijacker DB Cooper. (S1, ep 1)

Dead Zone: A suspicious disappearance in Troy's backyard sends the King of the Swamp deep into the bayou to confront beasts known and unknown. (S2, ep 2)

A ghost ship is found abandoned on a remote island that's home to one of the world's last uncontacted tribes. (S4, ep 19)

Greece: In 1944, 28 Greek socialists were shot in Syntagma Square and 100,000 had perished by the end of the Civil War. Was this the old order Winston Churchill had longed for? (S2, ep 1)

The Smallest Ships of War: Ships don't have to be large to make history, like the 1776 gunboat built to stop a British invasion, or the remarkable story of the HA-19 sub. (S1, ep 8)

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. (S1, ep 5)

The Treasure Within: Jeff and his team's search for the wrecks of Mary, Joseph and Neptune takes them further into uncharted territory. (S1, ep 5)

Secrets of the Sumerians: When the ancient Sumerians built their civilisation, they credited their gods - but were these powerful beings actually extraterrestrial visitors? (S16, ep 7)