Deep underground in Poland lies something remarkable but little known outside Eastern Europe. For centuries, miners have extracted salt there, but left behind things quite startling and unique. Take a look at the most unusual salt mine in the world. From the outside, Wieliczka Salt Mine doesn't look extraordinary. It looks extremely well kept for a place that hasn't mined any salt for over ten years but apart from that it looks ordinary. However, over two hundred meters below ground it holds an astonishing secret. This is the salt mine that became an art gallery, cathedral and underground lake.

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