OLDEST: Pons Fabricius – Built in 62 BC this Roman bridge connecting Campus Martius to Tiber Island still exists in its original state and has been in continuous use since its construction. The bridge is 203ft long and 18ft wide and is made up of rocks, bricks and limestone. TALLEST Millau Bridge – This stunning cable stayed vehicular bridge in France is the tallest in the world, with one mast reaching a height of 1,125ft. On cloudy days the bridge appears to almost float on the clouds.