DESCRIPTION: The dense jungle of the Peruvian Andes hides a sacred city - Machu Picchu, an enchanted 500-year-old stone citadel, hidden deep in the mountains where not even the Spanish conquistadores could find it. Thanks to its location on a precarious ridge in the sacred mountains of Peru, Machu Picchu is one of the most inaccessible cities in the world; there's still much that we don't know about the city and the people who lived there. Using cutting-edge, 3D laser-scanning technology, structural engineer Steve Burrows leads his team of experts into the Peruvian jungle to scan the sacred Inca city, asking three main questions: How did the Inca build a city atop a mountain ridge? How were the terraces constructed? And how did they supply water to the city? Join the team as they turn back time and decode the past.