Poland's Underground Salt Cathedral

The Wieliczka Salt Mine, located in the town of Wieliczka in southern Poland, lies 135 meters (443 ft) underground within the Kraków metropolitan area. The mine, built in the 13th century, produced table salt continuously until 2007, as one of the world's oldest salt mines still in operation.

Commercial mining was discontinued in 1996 due to low salt prices and mine flooding. Now a museum, the Wieliczka Salt Mine's attractions include dozens of statues, three chapels and an entire cathedral that has been carved out of the rock salt by the miners.