New answers tagged peak-district
There are four tourist visitable "caverns" (a large amount of the underground space in them was actually created by mining) around Castleton, in the dark peak. Treak Cliff Cavern Blue John Cavern Peak Cavern Speedwell Cavern Of those, I would specifically avoid Speedwell - the tour is on a boat, and there will be no way out. I was in Treak Cliff cavern ...
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