Sky History 2 Sunday

Researchers claim hidden messages can be found within the works of Leonardo da Vinci and other artists that may reveal an extraterrestrial influence

Investigations into the possibility that extraterrestrials with a superior knowledge of science and engineering landed on Earth thousands of years ago

Theorists speculate about the existence of black holes on Earth, which may explain strange disappearances and other inexplicable phenomena

The 11-day Ruby Ridge standoff of August 1992, which followed efforts by Idaho authorities to apprehend and arrest alleged white supremacist Randy Weaver

An array of mysterious phenomena, as seen from above. These include a Nazi weapon in Northern France and a Russian military tower near Chernobyl

Researchers claim hidden messages can be found within the works of Leonardo da Vinci and other artists that may reveal an extraterrestrial influence

Investigations into the possibility that extraterrestrials with a superior knowledge of science and engineering landed on Earth thousands of years ago

An alien race claimed to have been encountered by a military man stationed at Nellis Air Force base in the Nevada desert

A look at burials, funerary remains and relics from age old death rituals, to shed new light on the secrets of ancient civilisations

How a well-preserved Viking ship discovered in 1904 continues to present archaeologists with new mysteries to unravel

The bombing of Greenpeace ship the Rainbow Warrior in July 1985, which resulted in the death of photographer Fernando Pereira

An alien race claimed to have been encountered by a military man stationed at Nellis Air Force base in the Nevada desert

A look at burials, funerary remains and relics from age old death rituals, to shed new light on the secrets of ancient civilisations

How a well-preserved Viking ship discovered in 1904 continues to present archaeologists with new mysteries to unravel

An insight into the secrets surrounding the 10 biggest and most mysterious conspiracies in history, including the goings-on at Area 51

A look at the CIA's rumoured investment in psychological operations, asking if there could be an army of remote viewers watching the American public today

An investigation into the plausibility of apocalyptic prophecies throughout history

An insight into instances in which fighter pilots have been sent to investigate what were thought to be enemy aircraft, only to encounter something entirely unexpected

Recounting an instance when an Australian rancher went to check what was frightening his herd. He spotted a large UFO, which then sped off into the distance

Recounting how members of a Christian youth group observed a falling star while on a hillside. Things became even more unusual when an object landed close to them

Researchers claim hidden messages can be found within the works of Leonardo da Vinci and other artists that may reveal an extraterrestrial influence

Investigations into the possibility that extraterrestrials with a superior knowledge of science and engineering landed on Earth thousands of years ago

Theorists speculate about the existence of black holes on Earth, which may explain strange disappearances and other inexplicable phenomena

How methods for covertly capturing sensitive data have grown infinitely more advanced as the devices used to do so have become exponentially smaller

An anomaly detected in the grounds of a castle in Scotland suggests that it may be the site of the legendary Round Table of King Arthur

The team uses high-tech sidescan sonar and deep sea magnetometers to search for evidence after learning of an encounter with an underwater phenomenon

Experts question whether the facts of Earth's alien past could be buried in areas that - thanks to warfare or instability - are presently off-limits to exploration