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Inner Space Cavern
Hidden for more than 10,000 years, the Inner Space Cavern was discovered by the Texas Highway Department core drilling team, in the spring of 1963. While digging through 40 feet of solid limestone, the drill bit suddenly broke through into space, and dropped 26 feet, into what is now known as the Inner Space Cavern. Lowered through the opening while standing on a drill bit,a brave highway department employee was the first person ever enter the cavern!
Just 24 miles north of Austin, just outside the lovely community of Georgetown TX.at IH-35 at exit 259, the Inner Space Cavern is filled with history, mystery and chemistry. It is a living cave with spectacular displays of helictites, ancient 
flow stones, cave drapery, giant columns and much more.
Visitors can learn about the cave’s history during one of Inner Space Cavern’s daily guided tours. For more adventurous types, there is also a guided spelunking tour, where visitors can explore the 1.2 miles of cave. Admission discounts are available for military and AAA members.