Treak Cliff Cavern, just outside the village of Castleton, has a truly impressive collection of Blue John stone.  It is designated a Site of Special Scientific Interest and its deposits of the rare mineral are so rich that 500kgs are still mined each year from the cave, away from the visitor routes.

Treak Cliff Cavern is made up of natural caverns as well as those created from lead mining operations.  The visitor route takes in a number of stunning chambers, with names such as Aladdin’s Cave, the Frozen Waterfall and Fairyland, containing beautiful formations, fossils, stalactites and stalagmites.

There is also a well-stocked gift shop, and visitors can even polish their own piece of Blue John stone to take away as a souvenir.

Dogs on leads are welcome within the cave.

Image credits: Treak Cliff Cavern