Footage shows members of the public walking the bridge for the first time It's finally happened. The much-heralded "world's highest and longest" glass-bottomed bridge has opened to visitors in central China. It connects two mountain cliffs in what are known as the Avatar mountains (the film was shot here) in Zhangjiajie, Hunan province. Completed in December, the 430m-long bridge cost $3.4m (£2.6m
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