Wikipedia describes The Devil's Arse (quoted below). The cavern's name was changed back to its original with royal approval because in the Victorian period people were offended by its name. Today we are free to enjoy The Devil's Arse as it was meant to be heard.
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'The Peak Cavern, also known as the Devil's Arse (so called because of the flatulent-sounding noises from inside the cave when flood water is draining away), is one of the four show caves in Castleton, Derbyshire, England. Peakshole Water flows through and out of the cave.
Unlike the other show caves in the area, Peak Cavern is almost entirely natural; the only artificial part of the cave was blasted to bypass a low tunnel that was only accessible by lying down on a boat. The cave system is the largest in the Peak District, and the main entrance is the largest cave entrance in Britain. Until 1915 the cave was home to some of Britain's last troglodytes (the cave-houses at Kinver Edge near Kidderminster were populated until the 1950s), who lived in houses built inside the cave mouth, and made a living from rope making, while the depths of the cave were known as a haven for bandits.[citation needed] In legend, it was where thieves' cant was created by a meeting between Cock Lorel, leader of the rogues and the King of the Gypsies.[citation needed]
Several passages lead from the entrance, known as "The Vestibule". The only one open to the public is "Lumbago Walk", named as traversing it requires most adults to stoop. The route continues through two main caverns, "The Great Cave" and "Roger Rain's House", and into a passage, "Pluto's Dining Room". This is the furthest point currently open to the public, but the show cave used to extend considerably further: down "The Devil's Staircase" to "The Halfway House" and then along an underground stream known as the "Inner Styx", via a series of bridges and under "Five Arches".
At this point, several routes are open to cavers. The main path, to the right, leads to "Victoria Aven", a sizeable shaft and on to "Far Sump", through which lies the Far Sump Extension. This area was first explored in 1980, but difficult access limited discoveries until routes through from Speedwell Cavern and James Hall's Over Engine Mine were opened in 1996. This permitted further exploration, and in 1999 Titan Shaft was discovered, at 141.5 metres (464 ft) the deepest pitch in Britain.
The name of the cave was changed in 1880 from "Devil's Arse" to "Peak Cavern" in order not to cause offence to Queen Victoria during a visit for a concert. More recently the cave has been promoted using its older, more vulgar name.'