When I was a kid, my parents took me to a lot of caves. I don't think they were trying to lose me, but I did become claustrophobic, and I don't willingly go in caves as an adult. Which is to say, I don't go at all. "Cavernous" is a memory.
I never have a title in mind when I start a painting, unless it's some really lame joke name. What I'm going for is a feeling, which came in the form of a song lyric: "I can see clearly now the rain is gone."