The Zhangjiajie Grand Canyon Glass Bridge — its official name is Yuntiandu — spans the gorge between two cliffs of the Wulingyuan country as the centrepiece of the Grand Canyon scenic area. Designed by the Israeli architect Haim Dotan, it hangs roughly 300 metres above the canyon floor on a metal frame carrying more than 120 panels of tempered glass. When it opened on 20 August 2016 it was the longest and tallest glass-bottomed bridge in the world; thirteen days later it closed again, overwhelmed by visitors, reopening that September with crowd management built into the design.
The Yuntiandu bridge crossed a Zhangjiajie gorge on glass in August 2016 and became the world's longest glass bridge — for thirteen days, until its own visitors forced it to close. The story of the span is also a story about crowd control.