Welcome to Zhangjiajie — the floating mountains that inspired Avatar's Hallelujah Mountain. Walk among 3,000+ vertical sandstone pillars that geologists say cannot exist anywhere else on Earth (quartz sandstone + 380 million years of erosion = no Grand Canyon, only this). Climb 999 steps through a 131m natural rock arch at Tianmen Mountain. Cross the world-record glass bridge 300m above a canyon. James Cameron actually came here in 2008.