This cavern has a pure form of fluorite known as Blue John . This semi-precious stone is worked for jewellery and larger pieces for a long time; the ruins of Pompeii contain vases made from this material. During your visit through these caves, you c..

The closest cave to Castleton is Peak Cavern , with an impressive entrance situated at the foot of the hill where the castle stands. For three centuries, until 1974, ropemakers lived here, their houses built at the entrance leading to the cavern. Th..