grotto
Pronunciation:
/ˈɡɹɒt.əʊ//ˈɡɹɑ.toʊ/noun
Definitions
A small cave.
An artificial cavern-like retreat.
A Marian shrine, usually built in a cavern-like structure.
A local organization of cavers that typically organizes trips to caves and provides information and training for caving; a caving club.