The town of Remolinos, in the region called Ribera Alta, near Zaragoza (Spain), has always been linked to salt mining . From Roman times to present the exploitation of halite has been continous in a landscape dominated by ravines that have excaved sinuous watercourses with larger meanders where they open the abandoned entrances of the mines.
More information at
http://www.espele.net/Mines/Remolinos/Remolinos.html 
Landscape of the region
meander with mine entrances
main entrace to La Real mine
gallery
abandoned truck
gallery, Note the alternating layers of halite (white) and pelite (dark)
gallery
gallery
life is complicated outside caves!