In 1947, former OSS agent, retired US Army Colonel, and explorer Leonard Clark, came into possession of a secret map that led him to 7 ancient cities of gold deep in the Amazon jungle of Peru. Despite being chronicled in his book, The Rivers Ran East, has anyone tried to confirm this historical discovery? Our Quest: To retrace Leonard Clark’s route along the Maranon River in Northern Peru, confirm his claims, and find these ancient ruins.