Las Médulas, Spain. Las Medulas were the biggest mine in the Roman Empire.

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Photo credit: © Jose Pedro Fernandes / Alamy / Afripics
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Keywords: ancient, argile, argilo, bierzo, biezo, cast, castile, close, del, detail, el, gold, heritage, hydraulic, las, leon, mankind, medulas, mina, mines, mining, montium, open, opencast, ponferrada, region, roman, ruina, site, soil, spain, spanish, tourism, travel, unesco, villafranca, world