The Amazon rainforest stretches for millions of kilometers, hiding ancient tribes, animals and maybe something else. What if under this mysterious canopy lies an advanced civilization? How did we miss ...

Ocara-Açu, a vast precolonial Amazon settlement, underlies the modern-day city of Santarém in Brazil, once serving as the core of a regional network that may have housed up to 60,000 people before the ...

The authors of a new study say they have found 24 previously unrecorded pre-Columbian earthworks in the Amazon, and they estimate there may be more than 10,000 such sites still hidden throughout the ...