A belvedere, either a type of summer-house or a roofed, detached porch-like structure, usually in a yard, park or lawn.
A small cave.
A Marian shrine, usually built in a cavern-like structure.
An artificial cavern-like retreat.
A local organization of cavers that typically organizes trips to caves and provides information and training for caving; a caving club.
A secretive name for a local group of underground Satanists.