As natural daylight recedes, a self-guided, paved trail leads downward from the yawning mouth of the main cavern, about 100 yards east of the visitor center. The route is winding and sometimes slick from water seepage above ground. A steep descent of about 750 feet, much of it secured by hand rails, takes you about a mile through the main corridor and past features such as the Bat Cave and the Boneyard. (Despite its eerie name, the formations here don't look much like
femurs and fibulas; they're more like spongy bone insides.) Iceberg Rock is a massive boulder that dropped from the cave ceiling millennia ago. After about a mile, you'll link up underground with the 1.25-mile Big Room trail and return to the surface via elevator. Footware with a good grip is recommended.
7 miles west of U.S. 62/180, 727 Carlsbad Caverns Hwy., Carlsbad Caverns National Park, New Mexico, 88220, United States