Jewel Cave National Monument is the perfect place for an exciting family adventure, with large chambers filled with boulders, tight crawlways, and narrow cracks which lead into the unknown. This is the third longest cave in the world, and it contains over 208 miles of mapped passages with a huge variety of geological features including nailhead spar, dogtooth spar, boxwork, cave popcorn, flowstone, stalactites, stalagmites, and draperies. A scenic walking tour is a lovely way to explore the cave and learn about the cave formations, its discovery and ongoing exploration.

Credit: South Dakota Department of Tourism