Speedwell Cavern in Castleton, Peak District. The Speedwell Cavern is one of the four show caves in Castleton, Derbyshire, England. It consists of a horizontal lead miners' adit leading to the cavern itself, a limestone cave.
The Devils Arse Cavern in Castleton , So called because of the flatulent noises that emit from its depths. Its name was changed in when Queen Victoria came to visit to "Peak Cavern" but the original name has had a bit of a resurgence.