Do we really give them the credit they deserve? > > Aside from the astronomy, amazingly accurate calendars, palatial buildings, and such, they also had technology that would not be discovered again for centuries, or in some cases, over a millennium. > > The Egyptian Glider(Not reinvented until Di Vinci, lost again until mid-1800's) > The Antikythera Mechanism(Triangle teeth not rediscovered until Di Vinci) > Nazca Lines(Not possible with modern technology until GPS) > Stone HengeAside from the sheer logistical nightmare of moving the menhirs, the astronomical precision is remarkable. (How the hell did they lift the capstones with no crane?) > > > The list goes on and on.. it would take you about 60 seconds to find a few examples. Just google unexplained artifacts.-How about Saysachyhuman outside of Cuzco. The stones are as big as Stonehenge and cut to survive earthquakes. In Cuzco, the same thing but the stones are smaller.