43min - The Mayan civilization dominated Central America for nearly 2000 years, but by the 9th century A.D., the great Mayan cities were abandoned, and the Mayan people vanished.
43min - The Maya created the most sophisticated calendar systems in the ancient world.
43min - Who are the beings with big heads and giant eyes that seem to have been visiting our planet for millennia? Known by researchers as the "greys," these mysterious beings have been depicted in rock-art and carved stone figures throughout the ages.
43min - There are numerous historical, religious and mythic accounts of ancient civilizations being wiped out by volcanoes, earthquakes, floods, and meteors. Did god, or nature bring about such disasters?
43min - NASA scientists, former astronauts and secret government files all point to the conclusion that there has been contact with extraterrestrial life in the past.
42min - A 14,000-year-old set of ruins with complex interlocking blocks defies earthly explanation.
43min - People on every continent have claimed to see the footprints of Bigfoot. And ancient myths and legends speak of an ape-like giant stalking the earth.
43min - Might an examination of Leonardo Da Vinci's masterful paintings, highly technical hand-drawn sketches, and private journals reveal knowledge of otherworldly technology and extraterrestrial beings?
43min - Is it possible that sightings of alien beings or UFOs may actually be evidence of time travelers from the future? And might ancient astronauts actually be time travelers from our future? Scientists explore the theoretical possibility of time travel.
43min - Angkor Wat, Cambodia, is the world's largest ancient religious temple.
41min - The Da Vinci Conspiracy: Experts scrutinise the paintings, journals and technical drawings of Leonardo Da Vinci.
41min - Time Travellers: Scientists explore the possibility that sightings of alien beings or UFOs may be evidence of time travellers from the future.
42min - Aliens And Dinosaurs: Theorists investigate a depiction of a stegosaurus found at Angkor Wat in Cambodia.
42min - Mystery Of Puma Punku: No one knows who designed and built Bolivia's sophisticated temple complex.
41min - Destination Orion: Experts question ancient civilisations' fixation with the Orion constellation.
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