Sky History 2 Saturday

Experts examine strange stone structures on New England and New York's landscapes, contemplating whether they offer clues of alien visitors to Earth

Serpent gods are found in many religious texts, but could these stories be describing reptile-like extraterrestrials, and are they still here today?

An assessment of whether past plagues have been brought to Earth by aliens and whether the planet is prepared for an extraterrestrial invasion of disease

The groundbreaking discoveries, inventions and inventors throughout history that have changed the way people live their lives

Drones reveal what's left of Henry Ford's American suburb in the Brazilian jungle. Plus, an aerial glimpse of New York's forgotten ghost town

Experts examine strange stone structures on New England and New York's landscapes, contemplating whether they offer clues of alien visitors to Earth

Serpent gods are found in many religious texts, but could these stories be describing reptile-like extraterrestrials, and are they still here today?

Experts open previously off-limits secret files in a bid to answer some of the most mysterious questions surrounding UFOs and extraterrestrial life

Reporter Robert Sherrod accompanies Marines on their assault of Iwo Jima and witnesses the horror of the fight, as well as the flag raising

A diamond with a sinister past, the bones of a world-famous bard, and a beach covered in 'cursed' stones

Strange descending lights spotted in 1980 at the now former RAF station at Woodbridge, Suffolk, by servicemen Jim Penniston, John Burroughs and Ed Casabang

Experts open previously off-limits secret files in a bid to answer some of the most mysterious questions surrounding UFOs and extraterrestrial life

In a Danish bog, hundreds of mutilated ancient bones are found, while a mysterious deserted island belonging to Russia is explored

A diamond with a sinister past, the bones of a world-famous bard, and a beach covered in 'cursed' stones

This latest collection of objects comprises an intriguing 35,000-year-old box, a steam-powered gun and a monument that may have been an Aztec throne

In rough water, salvors scramble to retrieve a cruise ship's anchor lost at sea. Teams hope to salvage cherished floating homes damaged by Hurricane Sandy

Kevin Sempé dives in search of wrecks harking back to the Roman Empire's greatness. The journey begins with the Nave Romana

Audacious jail and prison breaks, with insight from Hayes, whose legendary escape from a Turkish prison was the basis for the Oscar-winning movie Midnight Express

Experts examine strange stone structures on New England and New York's landscapes, contemplating whether they offer clues of alien visitors to Earth

Serpent gods are found in many religious texts, but could these stories be describing reptile-like extraterrestrials, and are they still here today?

An assessment of whether past plagues have been brought to Earth by aliens and whether the planet is prepared for an extraterrestrial invasion of disease

The fanatical women who took Hitler under their wing and trained him in the methods of high society to launch him to power, only to be left behind once he achieved it

Strange descending lights spotted in 1980 at the now former RAF station at Woodbridge, Suffolk, by servicemen Jim Penniston, John Burroughs and Ed Casabang

In a Danish bog, hundreds of mutilated ancient bones are found, while a mysterious deserted island belonging to Russia is explored

A look at suggestions that extraterrestrials could be altering human DNA and repopulating the Earth with alien-human hybrids