Hidden for 14,000 years, Inner Space Cavern is 4.76 miles of cavernous passageways directly underneath IH 35, making us the 4th longest cave in Texas.
Inner Space Cavern was discovered in 1963 by the Texas Highway Department. During regulation core testing ,the highway department drilled several core samples down through the ground and wound up drilling in to the top of the cave. They searched all over the surounding area but could not find an access into the cave. So they drilled a two foot wide hole down through 33.5 feet of limestone bedrock. The hole, known as the Discovery Hole, was the only entrance to the cave for several months. There are over 5 miles of cave passage way connected to Inner Space Cavern, making it the second largest cave in Texas.
Inner Space offers 3 types of tours:
Adventure Tour: This is the standard tour that runs about 1 hour (1 hr - 1 hr and 15 mins). 3/4 mile walk (round trip). Departs throughout the day. Check the webpage for pre-reserved tour times.
Adult: $19.95
Child: $11.95
Explorers Tour: Extended version of the adventure tour. It runs about an hour and a half and includes an extra passageway in its natural state (no paved walkway and no lights). Flashlights provided. Offered on limited availability so call ahead.
Adult: $21.95
Child: $13.95
Wild Cave Tour: This is our actual spelunking tour. It involves lots of crawling and climbing through deep, rarely seen passages through the cave. It runs about 4 hours and requires a reservation. Please call a few weeks in advance to get set up.
$100.00/person
Minimum of 4 people required (Max of 8)
