How did the residents of Machu Picchu get the water needed to survive in a hostile, mountainous, environment? Find out how geology and engineering combined to solve this problem.
600 years of torrential rains and landslides have done little to diminish the awesome sight of Ma...
(02:59)How did the residents of Machu Picchu get the water needed to survive in a hostile, mountainous, ...
(02:59)