Click http://users.pandora.be/educypedia/education/anthr opologysoutham.htm
and you will be taken to a website with masses of links to the history of South and Central American societies, including 'lost' cities. Once there, click on any of the headings which take your fancy.
I think you're right to stick the inverted commas on lost. Most of the ancient cities there were plundered rather than discovered in the conventional sense.