Inner Space Cavern
9:00 AM - 4:00 PM
Monday
9:00 AM - 4:00 PM
Tuesday
9:00 AM - 4:00 PM
Wednesday
9:00 AM - 4:00 PM
Thursday
9:00 AM - 4:00 PM
Friday
9:00 AM - 4:00 PM
Saturday
10:00 AM - 5:00 PM
Sunday
10:00 AM - 5:00 PM
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About
Inner Space Cavern was discovered in 1963 by the Texas Highway Department. During construction of Interstate 35, they were required to do regulation core testing, which required them to drill into the ground. As they did this, they inadvertently drilled into the cave 8 times out of the 20 samples they took. Once they lost those 8 drill bits, they knew they hit a cave. They searched all over the surrounding area but could not find any access into the cave. So, they drilled a 2 foot wide hole down through 33.5 feet of limestone bedrock. The hole became known as the Discovery Hole as it was the very first entrance into the cave (and the only one for several months!). As they explored, they have found over five miles of cave, making Inner Space Cavern the fourth largest cavern in Texas!
Suggested duration
2-3 hours
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4.5
702 reviews
Excellent
388
Very good
246
Average
56
Poor
5
Terrible
7

SummerGirl9999
Georgetown, TX5 contributions
Oct 2021
Our family of 4 (2 adults and 2 adult children) went on a small group Adventure Tour of the cave for our son's birthday. We live in the Georgetown area and have never taken the tour until now. Wow! It is a beautiful cave and well worth a visit!

The Adventure Tour was a 1/2 mile hike in and and a 1/2 mile hike out. It wasn't strenuous, but there was a little bit of water dripping and pooling so wear tennis shoes. The formations are amazing and feature stalagmites, stalactites, and flows from thousands of years, along with sink holes, water, and an amazing story about how the cave was found. It was found in 1963 during the construction of Interstate 35. I'm sure they have many wonderful guides, and ours was Grant. He was a retired science teacher and was so passionate and knowledgeable about the cave, it's history, and formations, that we were truly impressed. He showed us how some rocks absorbed water, and others showed bone fragments with a black light.

If you are in the area, I would highly recommend the Adventure Tour at Inner Space Cavern. There is also a Hidden Passages Tour (where you explore with a flashlight), and there is a Wild Cave Tour (where you crawl and climb into remote portions of the cave), but for a first time experience I would recommend the Adventure Tour. The tour is an hour to and hour and a quarter. Be sure to check the schedule for school groups, check the hours, and wear closed toe tennis shoes. They don't take reservations, but if you need to go at a specific time, check on a private group tour.
Written October 30, 2021
This review is the subjective opinion of a Tripadvisor member and not of Tripadvisor LLC. Tripadvisor performs checks on reviews.

Rick B
Round Rock, TX1,255 contributions
May 2022
Wow! This is only about 10 minutes from home but we had never been. We had a visit from friend from NC and this is something the had her interest so we loaded up the adults and two oldest Grandkids and away we went to Inner Space. I was pleasantly surprised by the size and formations in the cavern. The guide was very knowledgeable about the cave and made the trip through informative and a learning experience and all this right under I 35! I would do it again
Written May 23, 2022
This review is the subjective opinion of a Tripadvisor member and not of Tripadvisor LLC. Tripadvisor performs checks on reviews.

lanceo53
1,081 contributions
Mar 2020
Inner Space Cavern is a no brainer...if you enjoy caves, then you should visit when in he area because it is so easy to access right adjacent to Interstate Highway 35. The tour will take approximately an hour and a half, and you will be rewarded with views of beautiful cave formations including stalagmites, stalactites, columns, flowstone, rimstone, helictites, and soda straws. A very nice cave indeed.

The pathways are well maintained and easily traversed.

The guided "Adventure" tour will cost about $20...well worth the money.

Happy caving !!!
Written March 13, 2020
This review is the subjective opinion of a Tripadvisor member and not of Tripadvisor LLC. Tripadvisor performs checks on reviews.

U&Me4Ever
Texas223 contributions
Jul 2021 • Friends
I’ve been to quite a few caves and this one is one of my favorites. It has so many interesting formations inside and facts about the cave. Our guide, Sebastian, was really good at what he does and he’s funny too. My friends and I totally enjoyed the experience. Should use closed walking shoes since there are some puddles inside; temperature is about 72 degrees year round.
Written July 11, 2021
This review is the subjective opinion of a Tripadvisor member and not of Tripadvisor LLC. Tripadvisor performs checks on reviews.

Missangelcs
177 contributions
Dec 2021 • Family
There were lots of things to see. It was very beautiful it's quite a bit of a tour a lot of walking, took a bit over a hour. We felt as though we got our money out of it even though it was very expensive. Our cave guide was Garrett. He was kind of quiet not 2 and too enthusiastic we could've had a worse guide but we could have definitely had a better guide Overall we all still enjoyed our time and the beauty of the cave
Written January 7, 2022
This review is the subjective opinion of a Tripadvisor member and not of Tripadvisor LLC. Tripadvisor performs checks on reviews.

HerbertEdgewood
Orlando, FL1,894 contributions
Sep 2019
‘Ello chaps! Inner Space Cavern will take you on a tour beneath the hot Texas surface, and take you where air condoning comes free. The deep caverns beneath the surface where Earth has created one of Austin’s most treasured attractions. NOTE: Food and drink are NOT allowed on the tour. Claustrophobic? No worries, take the basic 45 minute tour and no need to kneel down or anything like that. But if you’re really daring and adventurous, they have a few extended tours that will guaranteed get you dirty, muddy, and squeezed into some of the tightest spaces.
Written January 20, 2020
This review is the subjective opinion of a Tripadvisor member and not of Tripadvisor LLC. Tripadvisor performs checks on reviews.

Carissa B
San Antonio, TX48 contributions
Jun 2020
We greatly enjoyed our Adventure Tour at Inner Space Caverns! Kristina, our guide, was funny, engaging, and informative. She kept everyone's attention, even our 4 year old daughter's. (Inner Space would be perfect for a child's first cave tour.) We've been taking the "Texas Cave Trail," so this is our family's 3rd cavern to visit. Cavern of Sonora is very sparkly, Cave Without a Name has very large rooms and formations, and Inner Space had a bit of both. (Plus Eastern Pipistrelle bats! We were thrilled to actually see a few of the little bats hanging around inside the cavern!)
Written June 19, 2020
This review is the subjective opinion of a Tripadvisor member and not of Tripadvisor LLC. Tripadvisor performs checks on reviews.

Michelle
Gotha, Florida3,103 contributions
Nov 2019
We did the hidden passages tour. We went into the deeper areas of the caves and used our flashlights to guide us as well as our guide. He had us turn off our flashlights at one point and it was complete darkness, like you couldn't even see your hand infront of your face. There were many formations with names and our guide was full of puns for our entire journey. We had plenty of opportunities for pictures and learned a lot about the formation and discovery of the caves. If you are not claustrophobic or afraid of the dark I would highly recommend this option. Remember, regardless of the outside temp the caves are at a constant temp of 72 F and 98% humidity which means it feels like 80 F. Also closed toe shoes are a must.
Written January 18, 2020
This review is the subjective opinion of a Tripadvisor member and not of Tripadvisor LLC. Tripadvisor performs checks on reviews.

Random traveler
Temple, TX4 contributions
Jan 2020
We've driven past Inner Space Caverns several times but never checked it out... too busy, places to go, etc. We had some downtime so decided to give it a go, and what a pleasant surprise. The history of its discovery is fascinating and the caverns themselves are a pleasure to experience. The tour group size was a bit large for our taste, but we were able to stay near the front and hear the comments of the tour guide, who was superb. The caverns were a warmish 72 degrees and humid, so jacket (or not) accordingly.

Not a taxing walk and the pathway was paved, if slippery. Wear grippy shoes! Tour length was about right and they had one pleasant surprise: a place to take group photos (then available for purchase in the gift shop).

For the more adventerous types there are more aggressive tours available, including one that involves about two miles of crawling on your belly. We'll leave those adventures for others, thanks very much.
Written January 20, 2020
This review is the subjective opinion of a Tripadvisor member and not of Tripadvisor LLC. Tripadvisor performs checks on reviews.

Edward's Assessments
Houston, TX345 contributions
Jul 2021
This was a fun excursion. We took 2 tours (Adventure/Hidden Passages) and it took about 2 hours and 15 minutes. Very interesting to learn about the caves and different rock formations. If you're scared of bats find something else to do besides these caverns. We saw many of them throughout our tours and you pass very close to them because many of the corridors are very tight. Don't forget to take a ride on the Saber Tooth!
Written November 18, 2021
This review is the subjective opinion of a Tripadvisor member and not of Tripadvisor LLC. Tripadvisor performs checks on reviews.

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Inner Space Cavern (Georgetown) - All You Need to Know BEFORE You Go

Frequently Asked Questions about Inner Space Cavern

Inner Space Cavern is open:
  • Mon - Fri 9:00 AM - 4:00 PM
  • Sat - Sun 10:00 AM - 5:00 PM