The world's longest pedestrian suspension bridge opened in Switzerland on Sunday, a ribbon-thin span nearly a third of a mile long that challenges hikers to proceed in places at nearly 28 stories above ground. Officials in the south of Switzerland unveiled the bridge after just 10 weeks of construction. It measures 1,620 feet long and rises as high as 278 feet above the Grabengufer ravine. The span is also impossibly narrow, at just 25.6 inches wide.
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