Huge ancient city found in the Amazon

 https://www.bbc.com/news/science-environment-67940671

While we knew about cities in the highlands of South America, like Machu Picchu in Peru, it was believed that people only lived nomadically or in tiny settlements in the Amazon.

The city was built around 2,500 years ago, and people lived there for up to 1,000 years, according to archaeologists.

It is difficult to accurately estimate how many people lived there at any one time, but scientists say it is certainly in the 10,000s if not 100,000s.