I can get claustrophobic, but I do like looking inside caves. So..I will be posting a few I find that are amazing to view even if not in it physically.
Grand Canyon? I was there once but I was at the top. I'd love to have been able to raft it. So many crooks and crannies to explore. It's beautiful. But no way would I do that skywalk thingy. Shudder.