There are probably tens of thousands of undiscovered ancient earthworks known as geoglyphs in the Amazon, new imaging research shows. Click through to see photos.
Hundreds of never-before-seen ancient ‘earthworks’ discovered in the AmazonMany of these structures date to around C.E. 100–300, during the time of the Aquiry civilization, and may have been used for ceremonial purposeswww.scientificamerican.com