Ruby Falls Cave is a stunning underground cavern located in Chattanooga, Tennessee. It is famous for housing the tallest underground waterfall in the United States, which cascades 145 feet. The cave is part of the Lookout Mountain and features unique rock formations and a variety of geological features formed over millions of years. Visitors can explore the cave through guided tours that provide insights into its history and geology. The tours lead to the breathtaking waterfall, where guests can enjoy the natural beauty and learn about the cave's formation. Ruby Falls is a popular destination for both tourists and locals alike.