Treak Cliff Cavern is the best of the caves around Castleton. It features the usual collection of stalactites and stalagmites plus the unique mineral known as Blue John stone.
![The interior of Treak Cliff Cavern near Castleton, Derbyshire (Photo: Andy Mabbett [CC BY-SA 3.0])](https://englandrover.com/wp-content/uploads/2018/08/treak-cliff-cavern-1280x853.jpg)
Treak Cliff Cavern is the best of the caves around Castleton. It features the usual collection of stalactites and stalagmites plus the unique mineral known as Blue John stone.
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