Porto - Ponte Dom Luís I

Many bridges span over the river Douro in Porto. The Ponte Maria Pia, a technical cousin of the "Viaduc de Garabit " in France, was constructed by Gustave Eiffel and his collegue Théophile Seyrig 1875/1877. The team split and 1881/1886 Mr. Seyrig built the Ponte Dom Luís I, seen here. With a span of 172m. it was the the longest bridge of this type worldwide. On the lower deck are cars, the upper deck is for pedestrians and the Metro Line D.