1
Robber Baron Cave
Austin,
TX
The entrance to Robber Baron Cave is a large sinkhole. It was developed as a showcave in 1926, and until its closure in 1933 some 300,000 people have visited the cave. The visitors were lowered to the entrance with a cable... showcaves.com
4
Inner Space Cavern
4200 S Interstate 35,
Georgetown,
TX
Discovered in May 1963 on land of W.W. Laubach by core-drilling team, Texas Highway Department. Exploration began in November 1963 and continues to present. Carved by water from Edwards Limestone, cave lies along the Balcones f... hmdb.org