This underground mine in Poland is home to a cathedral and 40 chapels
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Wieliczka Salt Mine - Wikipedia
The Underground Salt Cathedral of Poland - Elaine Jordan
Wieliczka, Poland - World's Most Famous Salt Mine — Adventurous Travels | Adventure Travel | Best Beaches | Off the Beaten Path | Best Countries | Best Mountains Treks
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Wieliczka Salt Mine - royal salt mines near Krakow (Poland)
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Underground church of Saint Kinga at Wieliczka Salt Mine located in the southern Poland near the city of Cracow Stock Photo - Alamy
Photos: Poland Ancient Wieliczka Salt Mine and Its Incredible Stories
The Wieliczka Salt Mine - HeritageDaily - Archaeology News