After ruling for more than 1,000 years and becoming masters of astronomy and architecture, the Maya abandoned their cities in the Central American jungle and vanished, creating one of history's most enduring mysteries. Here, archaeologist Kathryn Reese-Taylor and her team of international experts journey into the snake-infested Guatemalan jungle to uncover the reasons behind the ancient civilisation's collapse, hoping that the discovery of the lost city of Naachtun will answer the 1,000-year-old riddle