La Cuevona of the 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, archeology, bierzo, biezo, cast, castile, cuevona, del, el, gallery, gold, heritage, hydraulic, la, las, leon, mankind, medulas, mina, mines, mining, montium, monument, open, opencast, ponferrada, region, roman, ruina, site, spain, spanish, tourism, travel, unesco, villafranca, world