Sky History 2 HD Monday

The alleged existence of underground extraterrestrial lairs, concentrating on a cave in Ecuador said to hold alien knowledge, and a hidden city in Turkey

In the 21st century, UFOs have gone from fringe science to mainstream obsession. This programme examines society's proximity to understanding the strange events in the sky

Archaeological sites and historic wonders, from ancient standing-stone circles to the ruins of castles and dwellings that ancient Britons occupied for generations

How Cleopatra's death in 31BC has been shrouded in mystery, with her body and final resting place lost without a trace for over 2,000 years

Strategic catastrophes and doomed military decisions, beginning with those whose rampant egos and misguided belief in their own abilities led to fatal mistakes

Reported sightings of angels, from ancient texts and biblical stories to more modern accounts, questioning whether they are the product of mankind's imagination - or really exist

From octopuses that can edit their DNA to jellyfish that can live for ever, this edition considers whether such unusual creatures were delivered to Earth by aliens

Part one of three. Robert Hardy presents this documentary chronicling the events of the Second World War, from the Blitzkrieg of Poland to the fall of Germany in 1945

German Second World War fighter, the Messerschmitt Bf 109. Along with the Focke-Wulf Fw 190, it serves as the backbone of the Luftwaffe's fighter force

Cousins Billy and John Smith recall driving in separate cars when they encountered a massive mothership three times the size of a football stadium

In rural Pennsylvania, several dozen witnesses claim to have seen a fiery object fall from the sky and land in a nearby forest

A new remarkable discovery reveals the last days of the Vikings, revealing the factors behind the breakage of their seemingly invincible power

Perplexing historical objects include the Jericho Head, a 9,000-year-old clay-covered artifact. Plus, a 1950s machine built to control the weather

Three stories that suggest aliens are among society, including an Arizona woman who claims to have been fathered by an alien in a top-secret government experiment

The River Hunters head to the River Lochy in search for evidence of the clashing Scottish clans embroiled in the 17th-century civil war

The Dunbar Armored Depot Heist of 1997, when Allan Pace and five old friends planned and executed a daring robbery of Los Angeles-based car company

The actor explores the Gardner Museum Heist, when in March 1990, 13 works of art were stolen from the Isabella Stewart Gardner Museum in Boston

Part one of two. The search for Slumach's gold sends the team 300kms away into the heart of mystery and murder. Back in Pitt Lake, an unlikely prospector makes a shocking claim

As the bloody civil wars rage on, Margaret manages to keep hold of her lands and her life under Yorkist rule, while Warwick leads a rebellion against Edward

A look at cases where people have claimed that strange voices have urged them to commit horrific deeds, and an analysis of whether they could have been obeying the orders of aliens

From octopuses that can edit their DNA to jellyfish that can live for ever, this edition considers whether such unusual creatures were delivered to Earth by aliens

Documentary going behind the scenes at the castle and exploring its history. The first episode focuses on the Beefeaters and reveals the origins of the tower

How, in 1942, the battles of Midway and Stalingrad began and Americans achieved a ground-breaking milestone in the development of atomic weapons

Ancient mysteries, including the unusually shaped skull of the Star Child that seems to suggest that aliens once walked the planet

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