Giorgio Tsoukalos and David Childress explore the mysterious chain of manmade islets in Micronesia's Nan Madol. Built from a staggering 250 million tons of volcanic rock, could the local legends be true--that strange visitors floated the massive rocks through the air? And might the site's powerful magnetic anomalies be the result of extraterrestrial technology?
Nan Madol
Micronesia · Saudeleur
Venice of the Pacific — built on artificial islands using massive basalt columns
Plain of Jars
Laos · Unknown
Thousands of giant stone jars — some weighing up to 14 tons — scattered across the Laotian plateau with no explanation
Yonaguni Monument
Japan · Unknown / Possible Natural
An underwater stone structure off Yonaguni Island appears to be a man-made pyramid and terrace complex