Even on a tight schedule, Brunelleschi's Dome Climb earns the hours.
Allow 1–1.5 hours incl. queue.
You climb between the dome's two shells, pass within touching distance of Vasari's vast Last Judgement fresco, and emerge to the best 360° view in the city. The catch: it's 463 steep, narrow, claustrophobic steps with no elevator, the timed slots sell out days ahead, and the staircase squeezes single-file past descending crowds. Anyone with mobility issues, claustrophobia, or a fear of heights should skip it outright.