First is the worst, second is the best, and jewelcavenps is the third longest cave in the world.🎖️ Jewel Cave in South Dakota, is named for its many rooms and passages covered with jewel-like crystals that sparkle like gems when illuminated. 💎 This underground spectacle is created by the cave’s abundant formations, the calcite crystals. Happy 115th Anniversary! #Anniversary #JewelCave #NationalMonument #Cave #Crystals #CaveSystems 📸: nationalparkservice Image: Inside a dark cavern, a person with a helmet is pictured with a light shining behind them.