It's been 50 years since Inner Space Cavern in Georgetown opened to the public and they're planning a big celebration to commemorate the anniversary.
Inner Space Cavern was discovered by a Texas Highway Department core drilling team in the spring of 1963.
FOX 7's Tania Ortega spoke to the second person to enter the cave, geologist Jim Sansom.
You can also take a 360 look at portions of the cave.
You can get more information here.