Jewel Cave National Monument
Custer, SD · Black Hills$
Jewel Cave, 13 miles west of Custer in the Black Hills, takes its name from the calcite crystals crusting its walls, the kinds called nailhead and dogtooth spar. More than 220…

Photo: Source / Public domain (US Government work)
Boxwork, rarely found anywhere else in the world, hangs from the ceilings of Wind Cave in South Dakota and lines many of its walls. In 1903 this became the eighth national park, the first created to protect a cave. Garden of Eden is the one-hour tour, with 150 steps, and the 30-minute Accessibility Tour goes in and out by elevator. Summer tours can sell out. Tickets open on Recreation.gov 120 days ahead, and about half are held back for walk-up sale at the visitor center, 11 miles north of Hot Springs. The bison herd started with 14 animals from the Bronx Zoo in 1913 and 6 from Yellowstone in 1916.
Caves
Canyons & deserts
Caves
63 placesAll 63, for anyone keeping count, with the famous ones up top and the quieter ones further down.
22 placesThe Park Service runs eight of these 22 caves, and most of the rest are commercial show caves at $23 to $36 an adult. If you only pay for one, make it Ruby Falls: you ride an elevator 26 stories down inside Lookout Mountain and walk to a 145-foot waterfall.