BBC NEWS | Science/Nature | 'Lost towns' discovered in Amazon

BBC NEWS | Science/Nature | 'Lost towns' discovered in Amazon: "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.

There are signs of farming, wetland management, and possibly fish farms.

The settlements are now almost completely overgrown by rainforest.

The ancient urban communities date back to before the first Europeans set foot in the Upper Xingu region of the Brazilian Amazon in the 15th Century."