Cardona, Spain  Cardona is a town in Catalonia, in the province of Barcelona; about northwest of the city of Barcelona, on a hill almost surrounded by the river Cardener, a branch of the Llobregat. To the east of the town, the river has been diverted through a tunnel has been dug through a spur, leaving a loop of dry river bed near the saltmine. Near the town is an extensive deposit of rock salt. The salt forms a mountain mass (called "Muntanya de Sal") covered by a thick bed of a reddish-brown clay, and apparently resting on a yellowish-grey sandstone. It is generally more or less translucent, and large masses of it are quite transparent. The hill has been worked like a mine since Roman times; pieces cut from it have been carved by artists in Cardona into images, crucifixes and many articles of an ornamental kind. The movie "Chimes at Midnight", by Orson Welles, was filmed at the castle in Cardona.