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Minotaur: A half-bull, half-man, the Minotaur is one of mythology's terrifying monsters. It's a bizarre tale of bestiality and human sacrifice - but what is the real-life origin? (S1, ep 5)

The Visitors: From the Dogon people to the Native Zuni tribe, many ancient cultures believed in outer space visitors. Could alien life have played a hand in human history? (S1, ep 1)

The Replicants: While many believe in reincarnation, experts suggest that extraterrestrials designed the human body to be a vessel for otherworldly beings. (S10, ep 12)

Robin Hood: Helen and Alex head to Sherwood Forest, the home of Robin Hood, to discover if he ever truly existed. (S1, ep 3)

Bakers Creek - Australia's Worst Crash: Australia's worst aviation accident happened in 1943 when 40 crew died in a B-17 bomber crash. (S1, ep 3)

Naper 28 - Death on the Great Plains: Garth Barnard fact-finds to determine the cause of a terrible accident in Nebraska in 1944, when a plane crashed during a violent storm. (S1, ep 5)

Russian Roswell: An exploration of the facts and myths surrounding the Soviet-era UFO research programmes at Kapustin Yar. (S1, ep 6)

The Galactic Keyhole: The mysterious keyhole symbol exists in mystic texts, sacred architecture and artwork found around the globe. Is there more to it than meets the eye? (S12, ep 38)

UFO Hotspots: Studies show 70% of UFO sightings occur in 'hotspots', where unusual phenomena is regularly reported. Is there something about these places that attracts visitors? (S15, ep 1)

Civil War Oxford: Alice explores the English Civil War through the history of Oxford, the city at the heart of a battle between an autocratic king and his rebellious parliament. (4 of 6)

The Sodder Children Disappearance: On Christmas morning 1945, five siblings vanish from their family home in West Virginia as a fire blazes. What happened is still a mystery. (S3, ep 8)

The Reckoning 1945-1948: In 1945, WWII was over but the violence had not ended. The survivors want to blame the Germans. The reckoning with National Socialism is ambivalent. (S1, ep 10)

Aliens and the Old West: Could aliens have already landed on Earth? Experts visit the Texas cemetery believed to hold the body of a life form that crashed there in 1897. (S3, ep 1)

A Spaceship Made of Stone: The Ishi-no-Hoden megalith in Japan was supposedly built to depict an ancient flying ship. Could this have been an ancient alien vessel? (S10, ep 13)

He-111: Germany's Frontline Bomber: A look at one of the most-recognised German aircrafts of WWII and how it became a guinea pig for future bombers. (5 of 6)

The Lancaster - Britain's Frontline Bomber: The troubled beginnings and amazing exploits of the legendary British heavy bomber. Plus, see a replica up close. (1 of 6)

China's Roswell: In 1938, hundreds of mysterious stone disks were found in a cave in China. Are these proof of contact with an alien race? (S1, ep 3)

Robbing the Cradle - The Looting of the Iraq Museum: As Baghdad fell to US forces in 2003,15,000 priceless antiquities were stolen. Learn about the efforts to catch the culprits. (S1, ep 1)

The Lost Viking Fleet of Roskilde: Roskilde's Viking Ship Museum is one of Denmark's top attractions, proving the interest in these seafaring people remains as strong as ever. (S1, ep 1)

Thousands of UFO sightings and abductions are reported every year. This series examines these accounts and casts new light on historic cases. (S1, ep 10)

Dead Peasants: A site on the Welsh border containing almost 1,000 skeletons reveals secrets about life during the Black Death. (S1, ep 4)

Portsmouth Age Of Empire: In Portsmouth, Alice Roberts learns about Nelson's dark side, the heat of the battle at Trafalgar, the role of the Navy in the British Empire, and more. (S3, ep 3)

Adam, Gwen and Julie recall personal encounters with UFOs, before experts' theories are put in doubt when we learn that each individual has time missing from their encounters. (S1, ep 2)

Cangrande Della Scala: Homicide detective Rod Demery and scientist Professor Turi King visit the ancient city of Verona, Italy, to examine the death of a 14th-century warlord. (S1, ep 5)

The Mad Bomber: Before the Unabomber, New Yorkers were terrified for 16 years by an attacker who planted bombs across the city. The culprit? An electrician named George Metesky. (S1, ep 5)