Longhorn Cavern State Park - Marble Falls TX "The park is named for Longhorn Cavern, a limestone cave formed by the cutting action of an underground river that receded thousands of years ago. Before the cave became a tourist attraction, it was used over the years by Indians, Confederate soldiers and outlaws, including outlaw Sam Bass.
From 1934 to 1942, Company 854 of the Civilian Conservation Corps constructed residences, pavilions and an observation tower in the National Park Service Rustic architectural style. They also explored and developed the cavern and built walkways." (wikipedia)
A Recorded Texas Historic Landmark erected in front of the administration building in 1989 reads:
"Longhorn Cavern opened...