- A shady cavern built as a garden feature. In the 18th century it usually took the form of an artificial rocky cave or apartment decorated with stalactites and shells in a wild part of the grounds.
- English Heritage
- http://creativecommons.org/licenses/by/3.0 (FISH Thesaurus of Monument Types)
- http://www.english-heritage.org.uk (FISH Thesaurus of Monument Types)
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