Imagine a national park so complex and, well, mammoth, that no one really knows its true size. Yes, signs mark entrances and exits, but underground, where limestone and water have carved the world’s largest cave system (412 miles and still counting), no one knows how vast it is or what will be discovered next. That’s the majesty of Mammoth Cave National Park (MCNP) in Central Kentucky. Every time you come back, you can learn about what has been newly discovered and what is better understood about what had been found before. (For more about Mammoth Cave, see my Moon Nashville guidebook.) Read Article Here