The UnXplained Special Presentation Season 1 Episode 11

Uncovering ruins from the past has been integral to our understanding of ancient civilizations. But sometimes, what remains of these cultures raise more questions than answers. For instance, why did once great empires such as the Maya or the thriving Khmer people at Angkor Wat suddenly vanish? And what secrets lie preserved under the ashes of the Roman city of Pompeii?