Bochnia Salt Mine

The Bochnia Salt Mine (Polish: Kopalnia soli Bochnia) in Bochnia, Poland, is one of the oldest salt mines in the world and is the oldest commercial company in Poland. The Bochnia salt mine was established between the 12th and 13th centuries after salt had been discovered there, and became part of the royal mining company, żupy krakowskie (Kraków Salt Works). In 1990 the mine ceased producing salt but remains a tourist attraction.
In 1981 the Bochnia salt mine was declared a heritage monument. It is one of Poland's official national Historic Monuments (Pomnik historii), as designated on 6 October 2000, and is overseen by the National Heritage Board of Poland.
The chapel in the mine has train tracks running through it.