Crystal Cave in Sequoia and Kings Canyon National Parks has reopened after a four-year closure! 😮 This marble cavern filled with stalactites, stalagmites, and underground streams is a hidden gem that requires reservations to visit. 💎 Book a seasonal guided tour to venture underground and explore this natural wonder. Be prepared for a steep half-mile hike to the entrance, and bring a jacket as underground temperatures hover around 50 degrees, even in summer. 🥾 📷 @flyingdawnmarie on IG | Visit