Texas has more than 2,000 known caves, most of which are located in the limestone and gypsum areas of central and west Texas. Cascade Caverns (near Boerne) has an impressive underground waterfall (http://www.cascadecaverns.com). While you're in the area, see Cave Without a Name, less well-known than Cascade Caverns (probably because it has no name) but still worth visiting (http://www.cavewithoutaname.com).
Natural Bridge Caverns (near New Braunfels) is a large, beautiful set of caverns with delicate and towering geological wonders. The variety and number of formations make this set of caverns one of the best in Texas—we highly recommend it (http://www.naturalbridgecaverns.com). Natural Bridge Wildlife Ranch, a wildlife park you can drive through, is adjacent to the caverns. http://wildliferanchtexas.com.
With walls of deep, rich color and brilliant crystalline formations, the Caverns of Sonora (near Sonora) have been called some of the most beautiful caves in the U.S.—after our last visit, we'd find it difficult to disagree—plus there's a free campground (http://www.cavernsofsonora.com). Inner Space Cavern, a limestone cave in Georgetown, was discovered in the early 1960s when the state was building Interstate 35. It's definitely worth seeing, even if the sound-and-light presentation is a bit touristy (http://www.innerspace.com).
Finally, Wonder Cave (in San Marcos), a cave formed by an earthquake millions of years ago, is part of the Wonder World tourist attraction, with a presentation somewhat similar to that of Georgetown's Inner Space. Because it was formed by an earthquake, it is not a "living" cave, so don't expect to see grand formations.
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