Speedwell Cavern
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The Speedwell Cavern is one of the four show caves in Castleton, Derbyshire, England.
This cave is mostly flooded. Boat trips take tourists around the cave including to the edge of a so-called bottomless well. A connection was discovered in 1999 between the Speedwell Cavern System and Titan, the largest natural cave in the UK, which is 141.5 metres high (464 feet).