This violent landscape of jagged mountains, caves and ravines in Spain’s El Bierzo region was once home to the Roman Empire’s most important gold mine. Today, the area is a popular destination for explorers who come to hike this strange terrain, shaped through the practice of ruina montium, a Roman-era mining technique in which mountains were undermined with large quantities of water. Las Medulas is now a UNESCO World Heritage Site, with remnants of Roman aqueducts still visible.
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