Yes, recently in fact. It was pretty cool, my kid really enjoyed it.
Yes, when I went to Virginia, I toured the Caverns of Luray.
Yes, Texas is home to many caverns
No I never tried that yet but think it could be a pretty exciting experience.
Yes. There are several caves near Rapid City, SD that I've been through.
Yes and I love it. I've been to caves in TX, CO, OK and Arkansas.