Mysterious ancient geoglyphs

Mysterious ancient geoglyphs discovered in Amazon rainforest

Mary Jo DiLonardo

Água Fria Amazon rainforest geoglyph

More than 450 geoglyphs were uncovered, believed to have been built 2,000 years ago. (Photo: Diego Gurgel)

In the often impenetrable lushness of the Amazon rainforest, it’s easy to see why many believed it was untouched wilderness before Europeans explored the area. But more discoveries show that indigenous people altered the land long before then. Read more.