Wretched Excess, 1564 Style; The Vasari Corridor in Florence, Italy, The Original Grade-Separated Pedestrian Skywalk

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credit: Wikipedia

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Here you can see the start of the corridor near the Uffizi, where it creates a collonade along the river's edge. It then turns left and goes across the bridge, built in 1345. The bridge was inhabited by butchers, convenient because they could just dump all their waste over the side. Cosimo I de' Medici didn't like the smell and evicted them all, replacing them with jewelry shops that remain to this day.