Shelta Cave

Shelta Cave is a 2,500 feet (760 m) long underground cave and lake located in Huntsville, Madison County, Alabama. It is described as one of the most biodiverse caves within the Appalachian Mountains. The cave is currently owned and managed as a nature preserve by the National Speleological Society, with their main offices directly above the cave. It was declared a National Natural Landmark in October 1971.

• http://en.wikipedia.org/wiki/Shelta Cave