Evidence for a past civilization is subtle -- so subtle that it can easily be mistaken for nature. For example, proponents of the ancient Amazon society theory rely heavily on the wide distribution of terra preta sites; pieces of land with fertile soil. Initially, researchers thought terra preta formed from volcanic ash deposits or old swampland.
Where did they go?
Oyuela-Caycedo and others believe that this society, like other indigenous groups of South America, were killed by diseases brought over by Europeans, including Spaniards like Carvajal.
http://news.discovery.com/history/natures-incredible-cover-up-an-ancient-amazonian-civilization.html
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