China's first high-altitude
suspension bridge made of GLASS opened in Hunan.
The 984 foot (300-meter) long bridge spans the gap between two
cliffs at the Shiniuzhai National Geological Park in Pingjiang
County. It's 590 feet (180 meters) to the ground below. The
glass floor panels are 24mm (about .9 inch) thick and 25 times
stronger than normal glass. Click the link to see pictures. LINK