Is it possible that the moon is actually a giant spacecraft allowing extraterrestrials to monitor planet earth? Learn more about this theory in this collection of .
Ancient Astronaut theorists believe that ancient man may have had extra-terrestrial help to build colossal structures like Stonehenge. Subscribe for more Ancient .
Take a look at the most fascinating conspiracies from Season 8, including communication via crop circle and the Hollow Earth, in this web exclusive. Subscribe .
Was earth visited in the past by Ancient Aliens flying UFOs around and telling there where to build their cities..perhaps hoping that one day in the future we .