Arno River and the Ponte Vecchio is one of Florence’s landmarks and probably the most photographed bridge in the city. The bridge was built at the narrowest part of the Arno. It’s distinguished as being the only remaining bridge to have houses and shops on it. In part this is because something important was built on top of those: the Vasari Corridor. This secret passageway built by Vasari for Duke Cosimo I de’ Medici in 1565 links the Palazzo Vecchio to the Pitti Palace.