Salt
The Wieliczka salt mine, close to the city of Kraków, produced salt continuously from its opening in the 13th century until 2007. The mine has a depth of 327 and extends for 287km.
The Wieliczka salt mine, close to the city of Kraków, produced salt continuously from its opening in the 13th century until 2007. The mine has a depth of 327 and extends for 287km.