Recent LIDAR scans have revealed ancient cities deep in the Amazon rainforest, home to at least 10,000 people around 2,000 years ago. These lost settlements, built by the Upano people between 500 B.C. and 600 A.D., are marked by extensive road networks, with the largest roads stretching up to 33 feet (10 meters) wide and running for over 12 miles (20 kilometers). The discovery of over 6,000 earthen mounds and sophisticated agricultural systems challenges our assumptions about ancient Amazonian civilizations, showing they were much more complex and populous than previously believed.
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