The Millau Viaduct and the highest bridge in the world. The highest architectural structure built by the hand of man in France is the arrow of the battery No. 2 of the Millau viaduct, it culminates at 343 meters high and exceeds the Eiffel Tower and 325 meters. The viaduct allows the A75 to "fly" over the Tarn valley at a height of 270m. Roger.