Linville Caverns

Linville Caverns are privately owned active limestone caverns located in northern McDowell County, North Carolina, just south of the village of Linville Falls, on U.S. Highway 221. The caverns are open to the public year-round for guided tours. Linville Caverns have been open for tours since the late 1930s and remain the only show caverns in North Carolina.

The caverns were discovered in 1822, by local fishermen and since that time have been of interest to locals and travelers alike. Half hour guided tours escort visitors through the caverns with information about cavern history, resident creatures, and the formations viewed along the way.

Source: Wikipedia