Inner Space Cavern

Inner Space Cavern (Also known as Laubach Cave) is a karst cave located in Georgetown, Texas. The cavern was formed by water passing through Edwards limestone. The cavern is estimated to be around 12–25 million years old but was open to the surface during the late Pleistocene period 10,000–45,000 years ago. It was discovered by the Texas Highway Department in 1963.

Cave data from Wikidata (CC0). Summary from Wikipedia (CC BY-SA).