'Lost towns' discovered in Amazon
The settlements show an advanced level of planning.
Read entire article at BBC
A remote area of the Amazon river basin was once home to densely populated towns, Science journal reports.
The Upper Xingu, in west Brazil, was once thought to be virgin forest, but in fact shows traces of extensive human activity.
Researchers found evidence of a grid-like pattern of settlements connected by road networks and arranged around large central plazas.