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Visitors crowd at the entrance of the glass-bottom bridge at Zhangjiajie Grand Canyon on August 20, 2016 in Zhangjiajie, Hunan Province of China. The Zhangjiajie Grand Canyon's glass-bottomed bridge welcomed its trial operation on Saturday and about 8,000 tourists crowded to view the grand glass bridge. Stretching 430 meters long and 6 meters wide, hovering over a 300-meter-deep valley between two cliffs in the canyon area, the much-awaited “world's highest and longest” glass-bottomed bridge has already set world records for its architecture and construction. (Photo by VCG/Getty Images)
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