Inner Space Cavern is a Karst cave located in Georgetown, Texas. The cave was discovered by the Texas Highway Department in 1963 during the construction of Interstate 35. There were no known openings to the cave before this time; however, some filled-in sinkholes have been found. Several miles of cave passage have been surveyed, with many sections of the cave remaining unexplored, due to filled-in areas blocking passage.

The caverns were carved by water through limestone. The caverns are estimated to be 90-100 million years old but only had an opening to the surface since the late Pleistocene period 20-45,000 years ago, evidenced by finds of mammoth and sabre-toothed cat bones.

The cave was opened to the public in 1966. Visitors enter via a cable car which is lowered into the cave. Tours are available of this easily accessed cavern, with 1.2 miles of passage being open to the public. However, non-public passages are well-guarded and independent exploration is not allowed.

Inner Space Caverns is the first cave to place felony charges on a visitor for damaging the cave's formations.

External links

• Inner Space Cavern official website

• Cavern Photos by Alexander Muse