Carlsbad Caverns, located in southern New Mexico, features over 100 caves, including Lechaguilla, the nation’s deepest limestone cave (1,567 feet). Lechaguilla holds formations and microbes found nowhere else in the world. Carlsbad Caverns is also home to a famous, massive colony of hundreds of thousands of Mexican free-tailed bats. The park features the Big Room, a massive limestone chamber measuring 4,000 feet in length, 625 feet wide, and 255 feet deep. According to the video, the Big Room could hold six football fields.