The World’s Tallest Bridge, Southern France. Millau Viaduct in France. As high as 1125 feet above the Tarn Valley. Milau has a total length of 8071 feet with the longest single span of 1122 feet. Bridge deck is supported by 7 pillars and weighs 36,000 tons. 7 towers, each 292 feet tall and weighing 700 tons, fitted to supporting pillars.