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almac68
Slightly further to the south, but somewhat related:
http://newscientist.com/article/dn27945-myth-of-pristine-amazon-rainforest-busted-as-old-cities-reappear/
Thanks to @Sumo for posting it in the Epic Win thread.
One of my more persistent impressions when reading about research into ancient history is that I always end up thinking that ancient populations must have been much larger than we currently assume. The re-emergence of these sites is also interesting in the light of old tales like the one about El Dorado.
It is very interesting to think that apart from the many already somewhat explored ancient civilisations of North America, Mesoamerica and Andean South America, there may also have been similar city-states or perhaps even empires in Amazonian South America.