Wieliczka Salt Mine
Actually you don't have to - because someone else did already... and boy did they ever do a nice job. This salt mine, located outside of Krakow Poland is the home of several undergound chapels as well as the usual salt mine attractions of slides from level to level. The Wieliczka Salt Mine also is steeped in history as during WWII it was the location of an aircraft factory manned by prisoners of nearby labor camps.
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