Machu Picchu

S1, E3: Structural engineer Steve Burrows leads his team of laser-scanning experts into the Peruvian jungle to scan the sacred Inca city of Machu Picchu. Using cutting edge, 3D laser scanning technology he wants to answer 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? The team hopes their laser scans will help decode the past.