The much-awaited longest and Highest Glass-bottomed Bridge in the world opened to visitors in Zhangjiajie, a scenic National Park in central China’s Hunan province. Spanning two cliffs in the Zhangjiajie Grand Canyon, the bridge is 430 meters long and 6 meters wide, hovering over a 300-meter vertical drop. It looks from the air just like a giant white butterfly. For the sake of safety, the glass-bottomed bridge only receives 8,000 visitors per day at most, who need to make appointments one day ahead during the trial operation. Paved with 99 panes of three-layered transparent glass was completed last December at a cost of 22.5 million Yuan.