An ice endurance contest takes place at the world's longest and highest glass bridge in Zhangjiajie, Central China's Hunan province, Dec 24, 2016. The 430-meter-long, six-meter-wide bridge, paved with 99 panes of three-layer transparent glasses, hangs between two steep cliffs 300 meters above the ground. The bridge has reportedly set 10 world records spanning its design and construction. [Photo/IC]