I found this in the cavern.

And deep within the sides of pine / and caverns of the womb by stealth enclose / armed men, a chosen band, drawn as the lots dispose."

Ye know mad Scylla, and her monsters' yell, / and the dark caverns where the Cyclops dwell."

The explorers ventured inside the caverns.

Thousands of delegates are expected to gather at Geneva’s cavernous Palexpo Exhibition center.

A dragon lives inside the cavern.

Meanwhile from neighbouring Tenedos once more, / beneath the tranquil moonbeam's friendly care, / with ordered ships, along the deep sea-floor, / back came the Argive host, and sought the well-known shore. / Forth from the royal galley sprang the flame, / when Sinon, screened by partial Fate, withdrew / the bolts and barriers of the pinewood frame, / and from its inmost caverns, bared to view, / the fatal horse disgorged the Danaan crew.

And so the veil falls, revealing the walls, of cavernous halls, Valhalla calls.

This remote cavern is known only to him.

His ships he hides within a sheltering cove, / screened by the caverned rock, and shadowed by the grove, / then wielding in his hand two broad-tipt spears, / alone with brave Achates forth he strayed.