

Krakow, Poland
Until the mid-1990, Wieliczka Salt Mine, just outside Krakow had produced table salt since the 13th century. Today it's one of the area's major tourist attractions. A four-hundred or so step staircase takes you into the bowels of the mine where a massive underground cathedral sits. Its walls are adorned with carvings that appear to be paintings, but like everything else in the mine they're made from solid granite-like rock salt. The cathedral appears ...