las dulas spanish landscape environment formed ancient roman gold mining operation |
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| navigate by keyword : rock geology plateau terrain mountain wadi valley formation cliff landscape hill canyon monument arch wilderness soil ridge spanish environment formed ancient roman gold mining operation considered largest open pit mine entire empire engineering work carried out blue cave eroded europe nature sandstone tourism tourist travel ponferrada sky summer tree river archaeological background beautiful bierzo 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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