Sky History 2 HD Sunday

Experts explore the similarities between huge pyramids across the world, and hypothesise on whether extraterrestrials could have influenced their construction and design

Experts investigate the work of Nasa and secret government files relating to extraterrestrial activity, looking for proof of alien contact in the recent or distant past

Ancient astronaut theorists hunt for evidence linking Bigfoot to alien species from the distant past, and ask whether the giant ape-like creature could be an extraterrestrial

Technologies, restorations and excavations reveal the secrets of the construction of the Holy Sepulchre of Jerusalem, the most sacred Christian site in the world

The beauty of Notre-Dame de Paris, which acts as an icon of French culture and its history while also attracting the attention of many tourists and aesthetes

Two-part documentary exploring the Anglo-Norman invasion of Ireland, beginning in the turmoil of 12th-century Ireland, where provincial kings compete for supremacy

Part two of two. In 1171, Henry II arrived to take control of Ireland, and granted land there to settlers from Britain. Cutting-edge science reveals their fascinating lives

Documentary series exploring anomalies appearing on satellite images to try and get a better understanding of unexplained phenomena

Investigating unusual patterns in an English field that could be an alien message, and a secret military facility in the Nevada desert

Experts explore the similarities between huge pyramids across the world, and hypothesise on whether extraterrestrials could have influenced their construction and design

Experts investigate the work of Nasa and secret government files relating to extraterrestrial activity, looking for proof of alien contact in the recent or distant past

A look at the silent threat of submarines, from tests in the River Thames, to the German's deadly U-boat attacks in the Second World War

The astonishing accounts of four railway journeys that changed history, including the perilous expedition that made a young Winston Churchill world famous

Espionage equipment, exploring the machines that hide in the shadows, capturing, transmitting and analysing vital combat information

Ancient astronaut theorists hunt for evidence linking Bigfoot to alien species from the distant past, and ask whether the giant ape-like creature could be an extraterrestrial

How, when a haunted attractions owner took on an empty hospital complex, he felt the wrath of its spirits. Plus, the Grim Reaper-like figure seen by a nurse in a New York care home

Paranormal activity inside medical buildings. A nurse is threatened by ghosts watching her every move. A war veteran experiences inexplicable events at his new job

Experts explore the similarities between huge pyramids across the world, and hypothesise on whether extraterrestrials could have influenced their construction and design

Experts investigate the work of Nasa and secret government files relating to extraterrestrial activity, looking for proof of alien contact in the recent or distant past

Ancient astronaut theorists hunt for evidence linking Bigfoot to alien species from the distant past, and ask whether the giant ape-like creature could be an extraterrestrial

Helen Skelton and Alex Langlands visit Sherwood Forest to learn more about the legend of Robin Hood - who may or may not have been real - and King John, who definitely was

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

Sightings of unexplained 'aerial phenomena' and reports of so-called 'first contact' moments, which are supported by credible eyewitness accounts or clear video footage

A look at UFO sightings, terrifying abductions and other bizarre occurrences, casting new light on historic cases