The Dom Luís I Bridge spans the River Douro in Porto between the southern margin of Vila Nova de Gaia, in the parish of Santa Marinha e São Pedro da Afurada. There’s a lower level and a higher one. Both carry pedestrians, while the lower one carries cars, the upper one carries light rail.
Construction commenced in 1881, and the good man Gustave Eiffel was one of the instigators. The span of 172m was the longest for any bridge of its type at the time and I think it’s still quite pretty.