ALBAWABA - Just steps southeast of Krakow, Poland, after descending 380 steps into the earth, a door opens onto a mysterious world, the Wieliczka Salt Mine. The Wieliczka Salt Mine is not merely an archaeological site, but an entire city carved from salt. It was designated a UNESCO World Heritage Site in 1978, having operated for nearly seven centuries before commercial production ceased in 1996. Along more than 150 miles ...