Little Cavern is a small cave located in the United Kingdom. It is located near the village of Castleton in Derbyshire, England. The cave is known for its unique formations and is a popular tourist attraction. The term 'Little Cavern' can also be used to refer to a grotto, which is a small cave or underground chamber. Grotto is a four-letter word that is often used as a crossword solution for the term 'Little Cavern'.