Carlsbad Caverns National Park

The otherworldly subterranean landscape of Carlsbad Caverns National Park is—justifiably—New Mexico’s most famous attraction. Take the self-guided audio tours of the Natural Entrance and Big Room (tickets and headphones are available at the park visitor center). Then sign up for a 1.5-hour ranger-led tour through the four Kings Palace chambers, which lie some 830 feet beneath the park’s surface and contain hundreds of eerie geological formations.