Treak Cliff Cavern

Underground World of Blue John

Treak Cliff Cavern is one of only two places in the world where the rare and beautiful Blue John mineral is still actively mined. This banded fluorite, found only in the Castleton area, has been quarried here for over 300 years, and its distinctive purple and yellow veins run through the limestone walls of the cave. On the self-guided audio tour, visitors follow a well-lit path through chambers like Aladdin’s Cave, Fairy Grotto and Dreamcave, where Blue John is displayed in situ alongside some of the finest stalactites and stalagmites in the Peak District. The tour is designed to be taken at your own pace, with Bluetooth beacons triggering information on your smartphone as you move through the cavern.

A Working Mine with a Story

The cavern began as a Blue John mine in the 18th century and remains a working mine today, with the family that owns it still extracting, cutting and crafting the stone into ornaments and jewellery. Above ground, a small museum showcases antique Blue John pieces, mining tools and historical displays that tell the story of the mine and its workers. This blend of active industry and heritage interpretation gives the site a unique character, setting it apart from more conventional show caves. The gift shop offers a wide range of Blue John items, from small souvenirs to high-quality pieces, as well as other rocks, minerals and fossils from around the world.

Visitor Experience Above Ground

Before or after the underground tour, visitors can spend time in the visitor centre, which includes a café serving hot and cold drinks, snacks and light meals, plus picnic areas with views across the Hope Valley. The site is open year-round (except Christmas Day), with longer hours in the warmer months and shorter winter opening times. Entry to the visitor centre and museum is free; the paid self-guided audio tour typically lasts around 45–50 minutes underground. The experience is suitable for older children and adults, though the path involves many steps and some low passages where taller visitors may need to stoop.

Getting There and Practicalities

Treak Cliff Cavern is located just off Buxton Road, a short walk or drive from the village of Castleton in the Peak District National Park. There is free on-site parking, and the site is accessible by public transport, with bus services serving Castleton and a short walk or taxi ride from the village. The approach from the car park is steep and involves a flight of steps, so it may be challenging for those with limited mobility. Dogs are welcome on a short lead, and the site is well set up for families, school groups and independent visitors, with clear signage, toilets and facilities for educational visits.