A stone structure, believed to be an astronomical observatory much like Stonehenge, has been found in the Brazilian state of AmapÃ¡. It consists of 127 blocks of granite stone. The pottery found at the site dates to 2,000 years ago.
Curiously, the BBC story states, “It was traditionally thought that before European colonisation, the Amazon had no advanced societies.” Yeah, well… bullshit. There are massive earthworks in Beni in Bolivia that are pre-Columbian. AmapÃ¡ is quite some distance away across the Amazon basin, but it is no stretch of the imagination to accept that there there were other advanced societies in the Amazon.
Update: I shoulda known. Alun has a lot more on the story.