An international team of researchers have identified tens of thousands of previously unknown Mayan structures using a high-tech aerial mapping technology known as Lidar. Discovered in the jungles of Guatemala, the ancient structures include homes, pyramids, defense installations, large-scale agricultural fields, and irrigation canals, suggesting that up to 10 million people lived in the area at its peak. “That is two to three times more [inhabitants] than people were saying there were,” Marcello A Canuto, a professor of anthropology at Tulane University, told The Guardian.