This weird and wonderful spot near Cajamarca draws visitors for its strange rock formations that mimic a stone forest. But the structure that was engineered by man, a pre-Inca aqueduct constructed around 1000 B.C., is most extraordinary. The 8km (5-mile) canal is carved from volcanic stone in perfect lines to collect and redirect water on its way to the Pacific Ocean. Right angles slow the flow of water and ease the effects of erosion. The aqueduct is likely the oldest man-made structure in South America.
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