Hints: Pangaea the Netherlands Poland Northern England the Austrian Alps millennia Europe Krakow chandelier

Parts of Pangaea were periodically flooded by shallow seas. But time and again this water evaporated, leaving layer upon layer of salt. Today these massive deposits lie buried deep beneath the Netherlands, Poland, Northern England and the Austrian Alps. They've been mined for millennia. Salt is a major ingredient for the chemical industry. It's also used, albeit controversially, to deice Europe's roads in winter, thousand of tons a day.
This particular mine, in Krakow in Poland, is made up of over 300 kilometers of tunnels. It’s so vast that miners have carved an entire underground cathedral out of the salt, even the chandeliers.

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