Aerial view of the glass-bottomed bridge across the Zhangjiajie Grand Canyon on June 12, 2016 in Zhangjiajie, Hunan Province of China. World's longest and highest glass-bottomed bridge over the Zhangjiajie Grand Canyon will open soon. The bridge stretched 430 meters long, 6 meters wide and the biggest vertical drop was 1,430 meters under the path. (Photo by VCG/VCG via Getty Images)
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