This subterranean city carved out of salt in Poland will astonish you
"The Wieliczka Salt Mine has existed — and been recognized as a marvel — for so long that its famous visitors include Copernicus, Goethe and Chopin. This incredibly unique space was officially recognized as a UNESCO heritage site in 1978 but had been used as a salt mine near Krakow, Poland, since the 13th century."
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