After getting caffeinated at Bar Zucca (don’t get ripped off sitting at a table: instead, stand at the bar and take in the magnificent mosaic walls), you’ll be sufficiently gassed to take on the 300 steps straight up to the Duomo’s roof. Although its mammoth marble façade and towering gothic interiors get the most instagram action, the lesser-known roof offers fantastic views of the city in between its giant winged buttresses and spindly spires. The entire experience takes 20 minutes and feels as exhilarating as a grammar school field trip.