Carlsbad Caverns National Park (http://www.nps.gov/cave/) is a unit of the United States National Park Service and a UNESCO World Heritage Site that is located near Carlsbad, New Mexico. It is most famous for the "Big Cave" and its Big Room, at one time considered the largest natural underground chamber in the world. Although no longer occupying that niche, it is still one of the world's largest cave rooms, and its unusually extensive and diverse decorations make it a prime destination for the tourist looking to venture underground.
