Wonder Cave (San Marcos, Texas)

Its entrance is one mile southwest of the Hays County Courthouse.

The cave is reported to be the only commercially operated dry-formed cave in the United States ("dry-formed" because the fissure was opened not by erosion but by the earthquake that produced the Balcones Fault).

[1] The cave is also home to Wonder World amusement park, which features tours of the multichambered cave and a wildlife park.

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