MIAMI, United States (AFP) — Long before European settlers arrived in the Americas in 1492, the Amazon rainforest was transformed for thousands of years by indigenous people who carved mysterious circles into the landscape, researchers said Monday. While the purpose of these hundreds of ditched enclosures, or geoglyphs, remains unclear, scientists say they may have served as ritual gathering places. Modern deforestation — coupled with aerial photographs of the landscape — helped reveal some 450 […]