open end ancient tunnel las medulas gold mini |
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| navigate by keyword : valley viewpoint balcony terrace end open work hole tunnel inside interior orellan canyon erosion environment cliff geology mdulas spanish spain roman empire metal excavation history mine leon castilla ponferrada medulas las orange heritage nature unesco red gold scenic site mines ancient tourist exploitation sandstone tourism iberian |
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| Open end of an ancient tunnel at Las Medulas - ancient gold mining site near Ponferrada in Spain. |
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