las médulas, an old roman mine, considered the largest open pit gold mine in the entire roman empire. declared by unesco

background beautiful blue castilla chestnut chestnuts clouds considered declared desert empire entire erosion europe forest forests gold heritage lands landscape largest las leon león medulas mine mines monument mountain médulas national natural nature old open orange outdoor panorama panoramic park peaks place ponferrada red reddish rock roman sandstone scenic site sites sky space spain summer sunset tourism travel unesco valley view world