10,000 Pre-Columbian Structures Could Be Hidden beneath Amazon Rain Forest

Next, the researchers used computer modeling to analyze known earthwork sites and predict their spread across the Amazon. That work considered a range of geographical factors such as distance to water, elevation and soil type (sandy soils, for instance, make short-lived earthworks). That work yielded the estimate that there are at least 10,000 eart... See more

Based on what the researchers knew about such structures, they estimated the huge number of these mysterious constructions that are likely hidden somewhere beneath still unsearched forest.