Entrance to the Blue John Cavern

Entrance to the Blue John Cavern is shown and named in a reusable Geograph picture. The saved point is the picture's recorded map point.

The Blue John Cavern is a limestone cave system known for its distinctive blue and yellow mineral deposits, primarily found in the Peak District of Derbyshire, England. It has a long history of human use, including as a source of the ornamental Blue John mineral, with archaeological evidence suggesting activity dating back to the Bronze Age.