Lost World Caverns, located just outside of Lewisburg, West Virginia, is an underground natural series of caverns. In November 1973, the caverns were registered as a National Natural Landmark as they "feature terraced pedestal-like stalagmites, flowstone, curtains, rimstone, domepits, and waterfalls. " Originally named "Grapevine Cave", the only entrance was a long vertical drop into which farmers used to dump dead livestock and other trash.