This documents the work of an English cartographer/satellite photo interpreter named Jim Allen - who has taken the two dialogues that Plato wrote about Atlantis literally. He has used modern technology and his understanding of ancient measurement systems to locate and area of the world that he believes matches Plato's physical descriptions of Atlantis. In a nutshell, he places the capitol of the empire in Bolivia - and he believes that the entire continent of South America is, in fact, Atlantis. He does have an interesting theory - and he has found some remarkable evidence to strengthen his claim.
Atlantis in the Andes
American Atlantis Research: http://atlantis.onestop.net