Georgetown, Texas: Inner Space Caverns

Cave exposed in 1963 by Interstate roadbuilding and turned into a commercial attraction. Features the "Lake of the Moon," and the "Flowing Stone of Time."
4200 N. I-35 Frontage Rd, Georgetown, TX
I-35, Exit 259, north of Austin.
Summer M-Sa 9-6, Su 10-6 (Call to verify)
Adults $21.
RA Rates:
Worth a Detour
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Visitor Tips and News About Inner Space Caverns

Reports and tips from visitors and Roadside America mobile tipsters. Some tips may not be verified. Submit your own tip.

Inner Space Caverns

Amazing! One of the best cavern tours I've been on. It gets pretty warm down there so I recommend shorts.

[Sunnysam, 04/06/2017]

The cave air temperature is a constant 72 F degrees.

Inner Space Cavern

I toured Inner Space often in college, and knew Meredith, who was the first to descend through the drill hole. He was not a highway worker but a caver, called by the highway construction guys to recover the drill bit. He was ecstatic when he looked around that beautiful room! By good luck, both he and the drill bit missed landing on one of the nicest formations.

In 1970 I went with cavers led by Meredith into back of the cave for mapping. I wonder if that part is open to tourists now? Inner Space is a real jewel of a cave!

[PixelAnnie, 04/03/2017]

Inner Space.

Inner Space Caverns

If you go late on a Monday to Inner Space Caverns, you may end up with a personal one on one tour -- we did -- was awesome!

[Annie, 06/15/2016]

Formations in Inner Space Caverns.

Inner Space Caverns

Just visited this cavern again and it's well worth the stop. The tour guides are friendly and very knowledgeable. If you phone before you arrive, they'll tell you which hours of that day should help you avoid mass tour groups of elementary school kids. Well-stocked gift shop. Depending on the time of year, you may get to see hibernating bats. They do turn off all the lights momentarily at one point during the underground tour, so be prepared for DARK. Wear comfortable shoes; it's a walk. Photography is allowed.

A staff member confirmed that comedian Bill Engvall, famous for his "Here's your sign" routine, did indeed work at Inner Space Caverns many years ago when he was attending college. Engvall stated this in his 2007 autobiography, Just a Guy, but he provides no details of the experience.

[Matt J. McCullar, 02/09/2008]

Discovery Hole, Inner Space Caverns.

Inner Space Cavern

I have visited this cave many times in the last 35 years. I have three Highway Department photos dated March 25, 1966, showing the workers entering the cavern at the time of discovery. It has declined over the years, due to flooding and loss of some of the original equipment and recordings.

Still, it is an awesome experience. The temperature is 72 year round and very humid. Drops of calcium-filled water will drip on you, there are some low spots in the ceiling, and some slippery spots. Wear tennis shoes and clothes you wouldn't mind getting stained. Lots of fun for kids of all ages.

[Jeff, 03/13/2007]

And kids of all ages, please note: you don't enter the cave by sliding down that pole.

Nearby Offbeat Places

Statue of Three-Legged WillieStatue of Three-Legged Willie, Georgetown, TX - 2 mi.
Doughnuts Larger Than Your HeadDoughnuts Larger Than Your Head, Round Rock, TX - 7 mi.
Ice Cream Cone BuildingIce Cream Cone Building, Pflugerville, TX - 11 mi.
In the region:
Giant Olmec Head Replica, Austin, TX - 23 mi.

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