(NBC) – The much-awaited longest and highest glass-bottomed bridge in the world opened to visitors Saturday in a scenic national park in central China’s Hunan province.
Spanning two cliffs in the Zhangjiajie Grand Canyon, the bridge is over 1/4 of a mile long and about 20 feet wide, hovering over a 1,000-foot vertical drop.
From the air, it looks 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, the bridge was completed last December at a cost of almost $3.5 million.