For more than 200 years, treasure hunters have been coming to Oak Island in search of a treasure that has so far eluded them all, and has even cost six men their lives, could it be, as legend suggests, the treasure is protected by a deadly curse.
A look at what could cause once-thriving groups of people to just abandon their great cities, never to return; modern scientific knowledge may be able to help answer the unsolved questions surrounding these lost civilizations.