The small town of Corydon in southern Indiana may soon get an influx of tourists thanks to a new attraction. Just discovered a few years ago, much of what is now Indiana Caverns was inaccessible to the public because all entrances were on private land. But a new passage not only opens up the underground caverns to the public, it gives visitors access to a curious pile of bones. Discoverers thought pioneers had thrown cow bones into the cave, but later came to find out the bones date back to the Ice Age. They come from a variety of species, including birds, snakes, bears, beavers, bison and more. Now, visitors can take an underground boat tour through the caverns for a chance to see the 12,000- to 15,000-year-old bones. The attraction just opened a few weeks ago, but it already tops TripAdvisor’s list of things to do in Corydon.