Nazca, the Pyramids/sphynx, Aztec pyramids, Stonehenge are all wonderous and awe inspiring but to suggest things like that are the work of, assisted or inspired by aliens always unfairly underestimates the genious, resourcefulness and dedication of our human ancestors.

It's often been a common fallacy to think that just because modern man is so much more technologically advanced that past civilizations were incapable of amazing architectural, artistic and intellectual feats and simple hard work.

All this is compounded by cash grabbing hucksters like Von Daniken, Art Bell, Richard Hoagland etc who play on our false sense of superiority and their own snake oil to sell us or hype their tales and hoaxes.