2. Millau viaduct bridge, France

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Soaring over the Tarn River valley, the Millau Viaduct is an engineering marvel and a symbol of modern France. At 1,125 feet above the valley floor, it is the world’s tallest bridge, its slender pylons piercing the clouds. The view is spectacular, but for the height-averse, crossing it is a true nerve test—gliding high with open sky all around is both thrilling and daunting.