The salt mine in the town of Wieliczka is one of the oldest rock salt deposits in Europe which was used from the 13th till the 20th century. The mine had been exploited through seven centuries of technological and methodological development of salt extraction. The underground corridors and galleries of modern museum and resort are located whithin 7 levels, with the depth from 57 to 198 m. Total length of underground mine passages is over 200 km. The object is on UNESCO World Heritage List from 1978, and now is combining the museum and health resort specialized in treatment of respiratory diseases. These facts make Wieliczka Salt Mine one of the most remarkable natural and industrial sites, not only in Poland, but also the whole Europe.
When the mine stopped finctioning in 1996, the local personnel was reoriented towards designing of underground tourist tracks, reconstruction of old tunnels, maintenance of their stability and safety, restoration of old mining machines and equipment. Nowadays the profit made from the tourism significantly overtaked the one from the industrial exploitation of the mine during its last decades of functioning. Currently, there are 194 km of workings and 2040 rooms registered. The tour starts from the older part of the mine where you descend into 'Danylovich' mine shaft (built in 1635–1642) using 394-step wooden stairs. They take you to the 1st adit level 'Bono' (64 m depth).
Apart from the tours, the service of medical treatment is also available. There is an underground health resort (135 m down the mine) providing visitors with unique salt mine underground microclimate. It appears at a temperature slightly above 10 ° C and relative humidity of 74-90%, when a therapeutic aerosol is formed underground. It's helpful in treatment of allergic diseases, bronchial asthma and other respiratory diseases.