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Secrets of the Maya: When Spanish Conquistadors obliterated the Mayan people's history, could they have erased proof of extraterrestrial visitors? Experts investigate. (S12, ep 6)

The story of Yorkshire Ripper Peter Sutcliffe, who murdered 13 women during a five-year killing spree that began in 1975. (S3, ep 4)

Alien Operations: Experts investigate reports of bird-like figures that practised advanced medical science in ancient times. Could they have been extra-terrestrial? (S5, ep 9)

Mysterious Relics: Experts investigate mysterious relics that have been revered by cultures for millennia. Could these sacred items truly hold divine or otherworldly power? (S5, ep 10)

Submarines: War Beneath The Waves: From early beginnings in the American War of Independence to modern day, this is the story of the submarine and its role in naval warfare. (S1, ep 2)

The guys hunt for Wild West collectables that they hope will fit in perfectly at country music star George Canyon's new home. (S4, ep 3)

The Druid Connection: Experts examine strange stone structures on New England and New York's landscapes. Could they be clues of alien visitors to Earth? (S12, ep 7)

The Reptillian Agenda: Serpent gods are found in many religious texts. Could these stories be describing reptile-like extraterrestrials? And are they still here today? (S12, ep 8)

The Right Tools: Victory in war doesn't just require sound military strategy, vital resources and equipment are also critical. Discover how the Axis powers failed in this regard. (S1, ep 4)

The First Metal Warships: Looking at early metal warships, and how HMS Rattler's screw propeller in 1845 would lead to the revolutionary HMS Dreadnought in the 20th Century. (S1, ep 4)

The Racial State 1933-1934: President Hindenburg suspends freedom of speech and Hitler comes to power in 1933. The first concentration camps for political opponents are set up. (S1, ep 4)

The Druid Connection: Experts examine strange stone structures on New England and New York's landscapes. Could they be clues of alien visitors to Earth? (S12, ep 7)

The Reptillian Agenda: Serpent gods are found in many religious texts. Could these stories be describing reptile-like extraterrestrials? And are they still here today? (S12, ep 8)

A ghost town covered in a strange, white power emerges from a lake in Argentina and a declassified CIA image uncovers a bizarre, giant Soviet weapon. (S4, ep 4)

When a man-made island mysteriously appears off the US coast, grisly new evidence points to secret government experiments into psycho-chemical warfare. (S4, ep 5)

A forbidden island points to a strange South American town that locals claim was the home of Adolf Hitler and a pit of bodies suggests fears of a zombie nightmare. (S4, ep 6)

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)

Bizarre underwater formations might point to a top-secret US weapons testing facility and a strange sighting in the Arctic could be a lost Nazi relic. (S4, ep 8)

The Vessels That Saved D-Day: A chronological telling of the dramatic D-Day story, focusing on the vessels that made the landings possible. (S1, ep 3)

Bludgeoned to death whilst walking down a country lane, the horrific murders of Lin and Megan Russell made worldwide news. Discover the events of that shocking day. (S1, ep 4)

Democracy Without Democrats 1929-1933: A protest turns into a racist and anti-Jewish movement during the 1920s and the NSDAP use emotions to gain the loyalty of the people. (S1, ep 3)

Into the Mountains (Tibet): Himmler's belief in the theory that the Himalayas were home to the Nazis' Aryan ancestors leads to an SS mission to the mountains. (S1, ep 4)

Ferdinand Porsche: The designer of one of the most popular car brands in history, Ferdinand Porsche would not have seen his success without the support of Adolf Hitler. (S1, ep 5)

The Druid Connection: Experts examine strange stone structures on New England and New York's landscapes. Could they be clues of alien visitors to Earth? (S12, ep 7)