The area around Castleton, in the Hope Valley, contains the most famous manifestations of the geology of the Peak District. A number of caves and mines are open to the public, including some former lead mines and Blue John mines (amethystine spar; the unusual name is a corruption of the French bleu-jaune, meaning "blue yellow"). The limestone caverns attract many people, which means that pretty Castleton is marred by a certain commercialization. Summer brings the crowds, many of which poke around in the numerous shops displaying Blue John jewelry and wares.


Trip Finder

No Thanks

Love To Travel?

Get FREE email communications from Fodor's Travel, covering must-see travel destinations, expert trip planning advice, and travel inspiration to fuel your passion.

Thank You

Now sit back, relax, and check your inbox to start planning your next travel adventure.

Please tell us more about the type of travel you're interested in. Check all that apply.