Organ Cave: a National Natural Landmark, and just nominated Historic Landmark.
"Located in beautiful southeastern West Virginia, Organ Cave is the second largest commercial cave in the eastern United States, and one of the oldest commercial caves in the country.
"A Natural National Landmark with over 45 miles of mapped passageways, Organ Cave is the 22nd largest cave in the world and there are still 200 known passageways that have yet to be explored."
"This cave is a living museum with the largest collection of Civil War hoppers left in the USA. This cave consists of fossils and petroglyphs, and Native American writings with age and meaning still unknown.
"Along with the cave, is a gift shop, cafe, and vinyl sign shop plus a limekiln."
Starting bid: $5 million