Amazon "Stonehenge"

http://www.aljazeera.com/archive/2006/06/200849144521423226.html
 http://en.wikipedia.org/wiki/Amazon_Stonehenge
http://www.wondermondo.com/Countries/SA/BRA/Amapa/Calcoene.htm
http://news.mongabay.com/2006/0514-amazon.html
http://www.msnbc.msn.com/id/13582228/ns/technology_and_science-science/t/another-stonehenge-discovered-amazon/
http://news.bbc.co.uk/2/hi/americas/4767717.stm
http://www.unexplained-mysteries.com/viewnews.php?id=70008