When outsiders first encountered the ancient Inca Empire of Peru, they were astonished by the magnifcent stone work -- and struck by an abiding sense of mystery, a fascination which has only grown over the centuries. In the 1960s, a Peruvian physician began collecting a bizarre series of carved rocks known as the Ica stones. These stones, claim the true believers, do more than just teach us the hidden history Peru... depending on whom you ask, they may rewrite the history humans entirely. Tune in to learn more in part one of this special two-part episode.