History
Get flash to fully experience Pearltrees
"Lost" Amazon Complex Found; Shapes Seen by Satellite
Hundreds of circles, squares, and other geometric shapes once hidden by forest hint at a previously unknown ancient society that flourished in the Amazon, a new study says. Satellite images of the upper Amazon Basin taken since 1999 have revealed more than 200 geometric earthworks spanning a distance greater than 155 miles (250 kilometers). (Related: "Huge Pre-Stonehenge Complex Found via 'Crop Circles.'" )