Sky History 2 HD Tuesday

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

Wreck divers Mike Barnette, Jimmy Gadomski and team investigators provide inside information on what may have happened to the most famous missing ships and planes

Earth's neighbour Venus has volcanoes, clouds of acid rain and a surface temperature hot enough to melt lead. Experts contemplate whether this makes Venus Earth's 'evil twin'

How, in a world without humans, sand, salt and sun would gradually dismantle cities, with wastelands quietly taking back the ground borrowed

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

How, in a world without humans, sand, salt and sun would gradually dismantle cities, with wastelands quietly taking back the ground borrowed

Humanity's strongest building structures were engineered to defy disaster. However, in a world without people, even the mightiest would begin to crack

Scientists explore how Earth would transform if humans vanished. Hidden dangers once held at bay by humans would erupt with force, such as chemical and nuclear plants

How, if humanity ceased to exist, homes from suburban mansions and Miami condos to rural farmhouses would face a relentless siege by fire, flood, wildlife and time

How the vast and fragile infrastructure hidden underground - from subways and pipelines to one of the big coal seams in the United States - would unravel if humanity vanished

The swamp expert and his crew return to the Louisiana swamps to extract the valuable treasure trove of old-growth cypress logs they discovered

Giorgio Tsoukalos draws on evidence from past series as he asks whether extra-terrestrials could have introduced the Greeks and Egyptians to electricity

The tide of the war begins to turn against Germany, prompting propaganda minister Joseph Goebbels to make a speech in which he calls for 'total war'

Egyptian queen Cleopatra's reputation as a ruthless genius. She would do anything necessary to cling to power in the face of an ever-expanding Roman Empire

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

Giorgio Tsoukalos draws on evidence from past series as he asks whether extra-terrestrials could have introduced the Greeks and Egyptians to electricity

How, in a world without humans, sand, salt and sun would gradually dismantle cities, with wastelands quietly taking back the ground borrowed

Humanity's strongest building structures were engineered to defy disaster. However, in a world without people, even the mightiest would begin to crack

Scientists explore how Earth would transform if humans vanished. Hidden dangers once held at bay by humans would erupt with force, such as chemical and nuclear plants

How, if humanity ceased to exist, homes from suburban mansions and Miami condos to rural farmhouses would face a relentless siege by fire, flood, wildlife and time

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