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Texas is blessed with some of the nations most interesting "show" caves and thousands of "wild" caves throughout the state. Because of the varying geographical regions and features of Texas, you could literally tour the entire state by jumping from cave to cave.
Inner Space Caverns, Georgetown, Texas - discovered in 1963 when boreholes were drilled to test for a highway overpass on IH-35. Many prehistoric animal remains were found due to sinkholes that were open to the surface 13,000-25,000 years ago.