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The Wieliczka Salt Mine in Krakow, Poland, has been mined continuously since the Middle Ages and miners have carved elaborate underground rooms and intricate sculptures within the Miocene salt. There is a gigantic subterannean cathedral carved entirely from salt including the floor, walls and decorations, with even the glowing chandeliers being made from salt crystals.

The Wieliczka Salt Mine in Krakow, Poland, has been mined continuously since the Middle Ages and miners have carved elaborate underground rooms and intricate sculptures within the Miocene salt. There is a gigantic subterannean cathedral carved entirely fr