New geological research suggests that the Incan city of Macchu Picchu is located at the spot where two faults in the tectonic plates meet. These faults produced an abundance of stone over millions of years, meaning that the Incans had plenty of stone easily available to build a city with. The researchers added that other Incan cities, including Ollantaytambo, Pisac, and Cusco, are located at similar intersections.
Those same fractures that provided stone also make for excellent drains. Which is important to help avoid flooding during the heavy rainstorms that can happen in the region. The excellent drainage almost certainly contributed to Macchu Picchu surviving so well, after its abandonment by the Inca, and being left to the elements for over 400 years.
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