You’re indoors in the sense that you’re protected from the weather and the elements, and the cave could even have some kind of covering or entrance area that could be considered a door or doorway. People have built homes in caves.
Is caving an outside, inside activity?
there are other ways to modify a cave
I’d like to know more about this picture!
Eagle’s Nest (sinkhole) in Florida
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Thanks! That was an interesting read!