Petra's famous rock temples were also giant water filters
The stunning rose-colored facades of Petra weren't just for show; they served as the high-tech control center for a desert water system that supported 30,000 people.
Carved directly into the sandstone cliffs of Jordan, the Treasury and Monastery of Petra are famous for their beauty, but their true genius lies in what is hidden behind the stone. The Nabataeans were masters of hydraulic engineering, carving a network of channels and dams that could capture every drop of the region's scarce 4-inch annual rainfall. These channels were tilted at precise angles to prevent the water from moving too fast and eroding the pipes.
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