grotto
grotto (grot"to) , noun
[Formerly grotta, from Italian grotta, Late Latin grupta, from Latin crypta a concealed subterranean passage, vault, cavern, Greek kry`pth, from krypto`s concealed, from kry`ptein to conceal. Compare Grot, Crypt.]
A natural covered opening in the earth; a cave; also, an artificial recess, cave, or cavernlike apartment.