Episode 24: Conspiracy Theory 3 - Ancient Aliens or Ancient Humans?

Were the Pyramids built by Aliens? Did Atlantis exist? The existence of spectacular and problematic structures all over the world have forced scientists and historians to either attribute these ruins to relatively primitive civilizations within a vague historical timeline, or simply blame all they can't explain on "Gods" from outer space...but could there be a third answer? Could the truth be as easy as we just got our history wrong? Would anyone be willing to accept it at this point and change the History books?