Sky History2

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.

Studies show 70% of UFO sightings occur in 'hotspots', where unusual phenomena is regularly reported. Is there something about these places that attracts visitors.

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.

On Christmas morning 1945, five siblings vanish from their family home in West Virginia as a fire blazes. What happened is still a mystery.

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.

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.

The Ishi-no-Hoden megalith in Japan was supposedly built to depict an ancient flying ship. Could this have been an ancient alien vessel.

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.

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

In 1938, hundreds of mysterious stone disks were found in a cave in China. Are these proof of contact with an alien race.

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.

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.

Thousands of UFO sightings and abductions are reported every year. This series examines these accounts and casts new light on historic cases.

A site on the Welsh border containing almost 1,000 skeletons reveals secrets about life during the Black Death.

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.

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.

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.

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.