WIELICZKA, POLAND - AUGUST 21: Wieliczka Salt Mine (13th century) is one of the world's oldest salt mines. Has over 300 corridors and 300 chambers on 9 levels. August 21, 2012 in Wieliczka, Poland.
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WIELICZKA, POLAND - AUGUST 21: Wieliczka Salt Mine (13th century) is one of the world's oldest salt mines. Has over 300 corridors and 300 chambers on 9 levels. August 21, 2012 in Wieliczka, Poland.