Archaeologists have squandered many lives and fortunes tracking down lost civilizations, and despite every fake and failure, the rare successes make all the risks worthwhile. That was certainly the case for these stunning South American ruins. Since their modern rediscovery, thousands of visitors have taken in the stone monoliths and awe-inspiring vistas. But now that the community's macabre origins are becoming impossible to ignore, what does the future hold for this mountaintop oasis?