The Blue John Cavern is one of the four show caves in Castleton, Derbyshire, England.
How Old Is Blue John Cavern?
The cavern takes its name from the semi-precious mineral Blue John, which is still mined in small amounts outside the tourist season and made locally into jewellery. The deposit itself is about 250 million years old. The miners who work the remaining seams are also the guides for underground public tours.
Which is the best Blue John Cavern?
Best Blue John Cavern - Treak Cliff Cavern
- Europe.
- Peak District National Park.
- Hope Valley.
- Castleton.
- Castleton - Things to Do.
- Treak Cliff Cavern.
