THE ADVENTURE COLLECTIVE® · Independent discovery and booking for outdoor travel
Pair cool subterranean passages with a backward, 630-foot zipline for a two-hour rush at Inner Space Cavern. Perfect for mixed groups—cave lovers and thrill-seekers get their fix in one accessible stop near Georgetown.
Pair cool subterranean passages with a backward, 630-foot zipline for a two-hour rush at Inner Space Cavern. Perfect for mixed groups—cave lovers and thrill-seekers get their fix in one accessible stop near Georgetown.
Book with Inner Space Cavern
Verified experiences and guided adventures in the surrounding area.
Operated by Inner Space Cavern · Georgetown, Texas
At the edge of Georgetown's I-35 corridor sits the adventure known as the Ice Age Tour at Inner Space Cavern, located at 4200 S. I-35 Frontage Rd. Georgetown, TX. This two-hour experience stakes a claim on two kinds of vertigo: the subterranean hush of an ancient limestone cave and a new tandem zip ride called The Saber Tooth that climbs 130 feet before hurtling riders backward 630 feet at up to 33 mph. The contrast—cool cave history and a high-flying mechanical thrill—defines why locals and visitors treat this outing as a half-day highlight in the Texas Hill Country. The cavern itself is classic karst country: passages cut into limestone over hundreds of thousands of years, chambers rimmed with stalactites and stalagmites and fossils embedded in drifts of calcite. Inner Space Cavern opened to the public after its discovery during highway construction, and the cave tours have long provided a dry, cool refuge from Texas heat while delivering geology you can feel underfoot. The Saber Tooth adds an aerial layer—guests ride a lift up to the zipline platform, pause to take in uncrowded views of the highway rippling through live oak and cedar, then launch backward on a short, intense flight that feels engineered to wake every nerve. Practical details matter here: the attraction is aimed at ages 10 and up with a minimum height of 42 inches; smaller kids must ride with an adult. Single-seat carts and strict weight limits (300 lbs individual, 450 lbs tandem) are enforced; the restraint system uses twin lap belts that lock for the cycle. The ride will not operate in thunderstorms or winds above 33 mph, and some medical conditions—pregnancy, recent surgery, heart or neck/back issues—are excluded for safety. Loose items are prohibited; storage is provided. Why book it? The Ice Age Tour condenses a handful of Texas experiences—cave geology, family-friendly interpretation, and a short but memorable zip—into one accessible stop less than an hour from Austin. It’s a good fit for mixed-ability groups: cave tours for those who want to explore quietly, and The Saber Tooth for thrill-seekers who want one precise, Instagram-ready rush. For photographers, the cave's mineral textures and the high-backward arc of the zipline make contrasting visual pairings—stillness and motion—within a single outing. Check weather and weight requirements before you go, arrive at the meeting point on time, and prepare to switch from slow, low light to full-throttle speed in the span of an afternoon. The team at Inner Space Cavern operates both educational cave tours and The Saber Tooth, making the site a unique anchor for outdoor learning and adrenaline. Reserve online ahead of time, arrive early, and leave bulky items in provided storage to keep your visit smooth.
moderate.
2 Hours.
Moderate — must be able to climb stairs, sit upright, and meet height/weight limits.
The Saber Tooth lifts riders 130 feet into the air before the backward descent.
Riders reach speeds up to about 33 mph on the 630-foot backward run.
Minimum age is 10 with a 42-inch minimum height; riders 42–47.99 inches must ride with someone over 48 inches. Max weight is 300 lbs individual, 450 lbs combined for two riders.
Yes—pregnant guests and people with recent surgery, heart, neck, or back problems should not ride.
No—loose items must be stored in the provided container before riding; flip-flops must be removed.
The ride shuts down for thunderstorms or winds above 33 mph and will remain closed until conditions are safe.
Inner Space Cavern was discovered during highway construction in the 1960s and later opened for public tours, revealing extensive limestone formations and fossils.
Stay on marked walkways, avoid touching formations, and leave no trace—cave minerals and microclimates are fragile and easily damaged.
Inner Space Cavern in Georgetown, Texas, operates a collection of underground and surface experiences that showcase cave formations, fossils, hands-on activities, and an aerial zip attraction. The site offers a range of guided and adventurous trips suitable for visitors seeking education, exploration, or adrenaline. Tours include the Hidden Passages Tour, where guests navigate secret cave passages with a flashlight, observe delicate formations, and follow rugged, untouched trails led by a guide; the Adventure Tour, which covers about a mile of cave passages and features Ice Age fossils narrated by guides; and the Wild Cave Tour, an authentic caving experience that requires crawling, climbing, and squeezing through tight passages to reach large chambers and rock formations. For outdoor thrills, Inner Space Cavern operates the Saber Tooth Zip Ride, which lifts riders 130 feet into the sky and sends them racing backward 630 feet at speeds up to 33 mph in a tandem configuration. The Ice Age Tour description provided also references the Saber Tooth Zip Ride. Family-friendly activities include Gemstone Panning, where guests search for gemstones and fossils using small bags or larger buckets and use an ID card to learn about their finds. All experiences list specific requirements where applicable, such as closed-toed shoes for certain tours. Inner Space Cavern emphasizes guided interpretation, hands-on discovery, and a variety of trip formats to meet different comfort and adventure levels. Staffed guides follow established safety practices and interpretive programs to ensure educational value and responsible cave stewardship for visitors of all ages.
Book with Inner Space Cavern