JOIN A LANTERN TOUR TO IMAGINE HOW EARLY ADVENTURERS FELT EXPLORING JEWEL CAVE. 6. JEWEL CAVE NATIONAL MONUMENT Located in a scenic ponderosa pine forest, this 1,279-acre park is a peaceful retreat for hiking, bird-watching and viewing colorful wildfl owers, though its most spectacular sight lies deep beneath the surface. Discover Jewel Cave, the third-longest cave in the world, which boasts more than 180 miles of mapped passageways as well as illuminated caverns, glittering dogtooth spar crystals, textured “cave popcorn” and ceilings dripping with stalactites. More on page 44. Don't Miss It’s natural to spend all of your time underground at Jewel Cave, but don’t miss discoveries in the skies: 120-plus bird species have been spotted on-site, from golden eagles to great horned owls. Pick up a birding checklist at the visitor center and play “I Spy” along the trails. NEARBY CITIES Custer: 12.5 miles 6 10 // #HiFromSD once in a lifetime