At the Bailong Elevator in Zhangjiajie National Forest Park, the real-life inspiration for the floating mountains in Avatar film series, a three-hour hike turns into just one minute. Built into a sheer cliff, it's a Guinness World Record holder for the highest outdoor elevator. As it rises out of the rock, the peaks of Yuanjiajie Scenic Area come into view, and one word says it all: "Wow."