2. Millau viaduct bridge, France

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Rising high above the Tarn River valley, the Millau Viaduct is a triumph of engineering and a symbol of modern France. Standing 1,125 feet above the ground, it is the tallest bridge in the world, with slender towers that pierce the clouds. The views are breathtaking, but for those uneasy with heights, the crossing is a true test of bravery. The sensation of soaring above the landscape, surrounded by sky and supported by a narrow road, is both exhilarating and intimidating.
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