Wieliczka Salt Mine
(inscribed according to criteria (iv))

This deposit of rock salt in Wieliczka-Bochnia has been mined since the 13th century. Spread over nine levels, it has 300 km of galleries with works of art, altars, and statues sculpted in the salt, making a fascinating pilgrimage into the past of a major industrial undertaking.

Information copied from UNESCO web site – http://whc.unesco.org/en/statesparties/pl/  

Gallery