Drivers freeze up on Michigan's Mackinac Bridge. But not just because of the height. There's something about this crossing that makes even locals scared.
Across the globe, bridges test human courage with dizzying heights and precarious designs. From Northern Ireland's Carrick-a-Rede Rope Bridge to China ...
The tourist attraction features a glass elevator going even higher, and will one day serve as a base for bungee jumping and paragliding.
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