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Bochnia salt mine
The Bochnia Salt Mine (Polish: kopalnia soli w Bochni) in Bochnia, Poland is one of the oldest salt mines in the world and the oldest one in Poland and Europe. The mine was established between the 12th and 13th centuries after salt was discovered in Bochnia. The mine was closed some time after World War I. In 1981 it was declared a monument. The mines measure 4,5 kilometres in length and 468 metres in depth at 16 different levels. Deserted chambers, shafts and passages form a so called underground town, which is now open to sightseers. The largest of the preserved chambers has been converted into a sanatorium.
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Keywords: bochnia, cave, salt