The historic Salt Mine in Wieliczka is the only mining site in the world functioning continuously since the Middle Ages. Lying on nine levels, its original excavations (longitudinals, traverses, chambers, lakes, as well as minor and major shafts) stretch for the total of about 300 kilometres: reaching the depth of 327 metres they illustrate all the stages of mining technology development over time.

Wieliczka Salt Mine near Krakow remembers the times of the Middle Ages. It one of the world’s oldest salt mine in the world. This is the only mining facility in the world functioning continuously since the Middle Ages to the present, allowing the evolution of mining technology in different historical periods. Wieliczka Salt Mine is about 260 km of excavation on 9 levels, the first of which – the level of Bono – goes to a depth of 64 meters, while the latter lies 327 meters below the surface. Total length of sidewalks, connecting about 3000 excavation (sidewalks, ramps, service chambers, lakes, wells, shafts), exceeds 300 km. The tourist route is 2,5 km, consists of 20 chambers located at depths from 64 to 135 meters.