las dulas spanish landscape environment formed ancient roman gold mining operation |
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| navigate by keyword : rock terrain cliff landscape mountain valley geology badlands hill formation plateau ruins canyon wadi wilderness arch landmark nature dulas spanish environment ancient roman gold mining operation largest open pit mine entire empire engineering work carried out antique cave eroded europe forest sandstone tourism tourist travel ponferrada sky summer river archaeological background beautiful bierzo castilla leon countryside desert erosion excavation formations green heritage natural outdoor peaks site spectacular unesco mountains park trees view stone rocks national scenic clouds peak |
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| Considered the largest open pit gold mine in the entire Roman Empire, the engineering work carried out |
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