Sky History 2 Saturday

Experts scrutinise prehistoric ruins, asking whether humans could have built such advanced structures alone, and examine the possibility of alien intervention

Investigating 'The Nine' - an alleged federation of extraterrestrial beings who some believe monitor and influence mankind

The Apollo 11 mission to the moon and the suggestion that the moon is actually a giant spacecraft allowing extraterrestrials to monitor Earth

The crucial decisions made by the wartime leader and how he had to navigate big changes and negotiate Britain's relationship with a powerful ally, as the conflict raged on

The catastrophic result of some of the world's worst engineering disasters caught on tape, examining their likely causes, focusing on a DC-10 aeroplane that exploded mid-flight

The US military has denied that the infamous 1947 Roswell crash was anything other than a weather balloon, but FBI files include a memo to J Edgar Hoover

Startling evidence suggesting that the Ancient Maya conspired with aliens, as experts hypothesise that they acquired extraterrestrial knowledge of astrology

Strange lights reported in 1980 by security officers near the East Gate of RAF Woodbridge - a US Air Force base in Suffolk

A silent, orange football-shaped object is spotted across two nights near the nuclear weapons storage site at Loring Air Force Base in Maine

Giorgio Tsoukalos questions whether Earth's stone monoliths were built with extra terrestrial help

Vandalism strikes the Wildman shop, inspiring Avery to finish building his Manta Coyote kit car. Mike hires a secret labourer to help with his '71 Super Bee

Forest fires threaten Rust Valley and after his neighbour loses 350 cars, Mike hoards back fuel in case he needs to save his own collection

A structure shaped like a shark that suggests evidence of a Bahamian lost civilisation. Plus, analysis of an image of a hurricane reveals thousands of animals trapped in its eye

A lake in Canada that may hold the key to whether life exists on Mars. Plus, a Second World War aerial photo possibly containing a coded message left by a vicious religious fanatic

A mission to take out four German howitzers about to assault Utah Beach during the Normandy landings, carried out by US paratroopers from Easy Company, the 101st Airborne Division

Emperor Domitian tasks master builder Haterius with constructing a labyrinth underneath the Colosseum floor

From the terrifying Tower of London to a hotel of horrors, discover the dark secrets hidden within these foreboding fortresses

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

The legendary Ohio Grassman is apparently captured in footage of a tall, dark-coloured, hairy creature walking through woods

Giorgio Tsoukalos questions whether Earth's stone monoliths were built with extra terrestrial help

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

A mystery that spawned a 75-year quest for an incomparable work of art worth half a billion dollars, lost without a trace

The Chernobyl nuclear disaster of April 1986, when tests being conducted at a nuclear power plant went awry resulting in the release of deadly radioactive materials

Theo Wilson revisits the Salem Witch Trials, a series of hearings and prosecutions of people accused of witchcraft in colonial Massachusetts between February 1692 and May 1693

Researchers study giant ancient drawings found etched into the desert floor, which may be a part of an ancient alien code

Ancient alien theorists explore the origins of mythical gods, and examine whether the tales of superhuman beings could be based on sightings of extraterrestrials