I was watching a program on NOVA this evening titled. "Ghosts of Machu Picchu". In one part, the narrator was describing a main plaza. Excavation had found that the plaza had a top layer of soil, under which layers of sandy soil and white granite were placed. The granite was chips from granite blocks the Inca had used to build the city. From there the water was directed to fountains and irrigation.
We are so brilliant in coming up with our new paving options. While the Incas had already come up with the system centuries ago. We prove once again that our discovery is actually rediscovery.
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