The Nazca Lines – Etched into a high plateau in Peru’s Nazca Desert, a series of ancient designs stretching more than 50 miles has baffled archaeologists for decades. Along with simple lines and geometric shapes, they include drawings of animals, birds and humans, some measuring more than 600 feet across.
Vimanas – Many Sanskrit epics, which were written in India more than two millennia ago, contain references to mythical flying machines called vimanas.
The Moai of Easter Island – The Polynesian island of Easter Island is famous for its “maoi”: the 887 giant human figures with enormous heads that guard its coastline. Roughly 500 years old, these monolithic statues stand 13 feet high and weigh 14 tons, but some are twice as tall and much heavier.
Puma Punku – Located in the Bolivian highlands, Puma Punku is a field of stone ruins scattered with giant, finely carved blocks. Such precise workmanship on a massive scale would have been nearly impossible without modern tools and machines, yet the ruins are more than 1,000 years old.