China opens longest glass bottom bridge in world Tourists who suffer from vertigo need not apply. The world's highest and longest glass-bottomed bridge opened Saturday in China's spectacular Zhangjiajie mountains -- the inspiration for American blockbuster Avatar. Some 430 metres (1,400 feet) long and suspended 300 metres above the earth, the bridge spans the canyon between two mountain cliffs in Zhangjiajie park in China's central Hunan province. IMAGES AND SOUNDBITES