7. Sidu River Bridge, China
China is leading the race for the best constructed bridges, and the Sidu River Bridge testifies to the engineering calibre of Chinese builders. This jaw-dropping 1222 m structure passes through the valley of the Sidu River, and is located around 550 m above sea level. It is part of the G50 Huyu Expressway that connects Shanghai with the Chonquing province of China; a route that passes through a breathtaking expanse of mountains and natural scenery. The bridge is held up by H-shaped towers, and is currently the highest in the world.