Sky History 2 Friday

The significance of the mysterious symbol of the keyhole found in mystic texts, sacred architecture and ancient artwork all over the planet

Studies show 70 per cent of UFO sightings occur in 'hotspots'. This programme examines what such places might possess to attract such 'visitors'

Alice Roberts explores the history of Oxford during the Civil War, when the city became a power base for the royalist forces and a rival capital for nine years of conflict

On Christmas Eve 1945, five siblings vanished from their family home in West Virginia as a fire blazed. What happened to them remains a mystery

The survivors and the winners of the Second World War wanted to blame the Germans. At the time, no one knew whether the Germans had really broken with the Nazis

Experts visit a cemetery in Texas said to contain the body of an alien who crash-landed on Earth in 1897

The documentary explores Japanese legends about the Kami, indigenous 'gods' to whom extraordinary large memorials have been created across the country

A look at the Heinkel He 111, one of the most numerous and esily recognised German aircrafts of the Second World War. Plus, how it became a guinea pig for future bombers

The troubled beginnings and amazing exploits of legendary British heavy bomber the Lancaster. Featuring a close look at a replica

The discovery of 716 stone discs by a Chinese scholar in a remote cave in 1938. The so-called Dropa Stones were found with what appeared to be the remains of many short humanoids

How the trade in stolen antiquities and art has become a major source of income for criminal syndicates, gangs, and terrorists across the globe

A trip to the Viking Ship Museum in Roskilde, Denmark, to observe the remains of a fleet of Viking boats and the modern historians attempting to recreate them.

Accounts of UFO sightings, exploring recently declassified top secret UFO files and casting new light on historic cases

Helen Skelton and Alex Langlands head to a Cheshire dig where archaeologists have dug up human skeletons that reveal secrets about life during the Black Death

Professor Alice Roberts visits Portsmouth to investigate the history of the Royal Navy, uncovering some uncomfortable truths behind the myth surrounding Lord Horatio Nelson

Part two of two. Adam, Gwen and Julie recall personal encounters with UFOs, before it is revealed that each individual has time missing from their plotted recollections

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 was an electrician called George Metesky

Experts visit a cemetery in Texas said to contain the body of an alien who crash-landed on Earth in 1897

The documentary explores Japanese legends about the Kami, indigenous 'gods' to whom extraordinary large memorials have been created across the country

Helen Skelton and Alex Langlands head to a Cheshire dig where archaeologists have dug up human skeletons that reveal secrets about life during the Black Death

The story of the changing face of tank warfare over the past 100 years from the first tanks produced in late 1914 to break the deadlock of Trench warfare on the Western Front

The troubled beginnings and amazing exploits of legendary British heavy bomber the Lancaster. Featuring a close look at a replica

The search for an alleged UFO thought to have crashed in Aurora, Texas in 1897. Investigators arrive at the scene to dig for evidence of the claim