Sprawling Mayan network discovered under Guatemala jungle
This highly corroborates Charles C Mann's book 1491: https://en.m.wikipedia.org/wiki/1491:_New_Revelations_of_the...From wikipedia: The book presents recent research findings in different fields that suggest human populations in the Western Hemisphere—that is, the indigenous peoples of the Americas—were more numerous, had arrived earlier, were more sophisticated culturally, and controlled and shaped the natural landscape to a greater extent than scholars had previously thought.