Grotto

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early 17th century: from Italian grotta, via Latin from Greek kruptē (see crypt).

wiktionary

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From Italian grotta, from Vulgar Latin grupta, from Classical Latin crypta. Doublet of crypt.

etymonline

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grotto (n.)

"picturesque cavern or cave," 1610s, from Italian grotta, earlier cropta, a corruption of Latin crypta "vault, cavern," from Greek krypte "hidden place" (see crypt). Terminal -o may be from its being spelled that way in many translations of Dante's "Divine Comedy."