Ancient Aliens and Dinosaurs - History Channel

Ancient Aliens and Dinosaurs - History Channel Angkor Wat, Cambodia, is the world's largest ancient religious temple. Within its megalithic ruins, researches have discovered a depiction of a species of dinosaur--a stegosaurus.

But how could the ancients have had knowledge of animals that mainstream science says died out millions of years ago? Why are dinosaurs extinct? Did an alien race of beings kill off the dinosaurs to make room for humankind?

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2012 Ancient Aliens : The Greys - History Channel

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Pre-historic sculptures of reptilian beings, remains with elongated skulls and ancient myths of gray-skinned visitors are all clues pointing to the theory that aliens have been a part of human history all along.

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