Inner Space Cavern is celebrating its 50th anniversary since the opening of the cave in July 1966. The cave was discovered when the Texas Department of Transportation was drilling to build the I-35 overpass over SE Inner Loop in 1963. The cave at 4200 S. I-35, Georgetown, offers three types of guided tours that explore formations and hidden passages. 512-931-2283,
ext. 6. www.innerspacecavern.com