The The Cave Without a Name near Boerne, Texas.

As it was explained to me by the tour guide, anywhere there’s limestone and water, you’re going to have caves. And the Texas hill country, which was under a sea millions of years ago, has plenty of both. So the hill country is dotted with countless caves. Many are well-known tourist attractions but the Cave Without A Name is out in the middle of nowhere and there were only a couple of other visitors when we went. Worth going out of your way to see it.