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Jewel Cave, located in the Black Hills of South Dakota, is the third longest cave in the world, boasting stunning calcite crystal formations that sparkle like jewels. Discovered in 1900, the cave offers guided tours ... that take visitors through its intricate passageways and chambers, showcasing its natural beauty. Popular activities include exploring the various chambers, admiring the unique formations, and learning about the cave's history and geology. The best time to visit is during the summer months when the cave is open for tours. Immerse yourself in the local culture and traditions by participating in ranger-led programs that highlight the significance of the cave to the Native American tribes in the area. Read more ▼