While on our trip to San Antonio with our families we stopped at the Natural Bridge Caverns. They are located about 30 minutes northeast of San Antonio. The caverns were really neat. It is worth your time to stop in and take the tour if you are ever in the area. It took about an hour to get through them and the tour is guided. Although our guide was a 17 year old girl who mumbled and talked unbelievably fast so whatever information she might have been spewing was probably worth knowing but since nobody could understand her, we will never know.
See the angry face below? Caleb hated the whole experience. I wouldn't advise taking toddlers who hate the dark and being confined in a small space.