
Over seven centuries, the mine has been transformed from a hole in the ground to an underground city, with 300 kilometers of galleries and 3000 chambers over nine levels. It features lakes, chapels, murals and even a ballroom -- all carved out of the salt.
The most spectacular chamber is the Chapel of Saint Kinga, 101 meters below the surface. Its walls were carved by three miners over a period of 68 years and feature a mural of the Last Supper. Even the chandeliers are made from salt crystals.
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Source: CNN.com