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Vortexes: The team travels to Sedona, Arizona, long known for strange phenomena, to interview witnesses to unexplained sightings of lights and objects in the skies. (S1, ep 9)

The Welsh Rebellion: Rick and Beau return to tackle new rivers in a brand-new series. From Wales to Scotland, the pair investigate the cold and murky waters of historic sites. (2 of 3)

The Industrial Revolution: The team search for artefacts from the country's first superhighway - the Bridgewater Canal. (S2, ep 5)

Abandoned Alpine Fortress: A group of hikers trekking across the Italian Alps stumble upon abandoned military infrastructure. What purpose did these camouflaged buildings serve? (S3, ep 8)

Over a Barrel: The Pickers arrive at Niagara Falls, diving into a collector's trove of memorabilia and oddities for big deals. (S2, ep 11)

Return To Mars: As humanity prepares to establish colonies beyond Earth, are we pursuing a new future for mankind or returning to its extraterrestrial past? (S11, ep 14)

Deadly Inventions: A team of experts tests the deadliest weapons upgrades across the history of warfare, including the Scorpio, the long sword and Henry's rifle. (S1, ep 9)

Discover the German submarines that caused havoc in the American desert, the playboy pilot they couldn't cage and the young lovers whose escape defied all odds. (S1, ep 5)

By Night & By Day: The story of a deadly war that intertwines Germany, Poland, Japan, Italy and Spain, and the remorseless development of weapons and bombers. (5 of 6)

Return To Mars: As humanity prepares to establish colonies beyond Earth, are we pursuing a new future for mankind or returning to its extraterrestrial past? (S11, ep 14)

A young boy makes international headlines when he uses satellite images to discover lost cities of the Maya and trees in China seem to be spelling out a sinister message. (S3, ep 19)

The myth of Merlin is associated with an arrangement of stones in northern France. Satellite images might finally explain this ancient riddle. (S3, ep 20)

Strange mounds in Transylvania might pinpoint the location of the tomb of the bloodthirsty tyrant believed to have inspired Dracula. (S4, ep 1)

A massive hurricane heads toward Florida but something unexpected is in its eye and bizarre marks across the eastern US leave experts baffled. (S4, ep 2)

Strange markings could be a coded message with a plot to overthrow the Queen of England and a lake with healing powers holds clues to life on Mars. (S4, ep 3)

Analysing if a Korean soldier captured during D-Day fighting for the Nazis was the most captured person in the history of war. (S1, ep 4)

Discover Hitler's last soldier in America who defied the FBI for 40 years, the prisoners who revealed the secrets of the death camps and the merciless Nazi who almost got away. (S1, ep 6)

Romeo & Juliet: When Samantha and Ronald develop a connection, they hatch an ambitious escape plan that utilises Ron's experience as a helicopter pilot. (S1, ep 1)

The Quest for the Holy Grail: As the Third Reich rises to power, Himmler fixates on the Holy Grail as his and the Nazis' desperation to capture this ancient relic intensifies. (S1, ep 3)

Hans Kammler: Hans Kammler's fingerprints can be found all over the Third Reich's most prestigious and deadly engineering projects, including rockets and concentration camps. (S1, ep 4)

Return To Mars: As humanity prepares to establish colonies beyond Earth, are we pursuing a new future for mankind or returning to its extraterrestrial past? (S11, ep 14)