Drone surveys over a newly deforested area in the Acre region of Brazil have revealed dozens of massive geometric earthworks. Unlike the well-known Nazca lines, these Amazonian geoglyphs are deep trenches and embankments forming perfect squares and circles up to 300 meters in diameter.
Archaeologists believe these were ceremonial gathering places for a large, sedentary population that managed the rainforest as a productive 'garden' landscape. The discovery further dispels the myth of the Amazon as a pristine wilderness prior to 1492.