BEIJING • Don't look down when you are crossing this new glass suspension bridge at the Shiniuzhai National Geo-park in China's Hunan province.

The canyon it spans is a heart-stopping 180m deep.

The 300m-long bridge opened to thrill-seeking tourists for the first time last Thursday.

Originally a wooden bridge, it was converted to glass in a revamp that began earlier this year.

With each glass pane being 24mm thick and stronger than normal glass, its creators say it is safe.

"The bridge we build will stand firm even if tourists are jumping on it," said one of the workers who built the bridge, CNN reported.