On a budget, Brunelleschi's Dome Climb still earns its price.
Brunelleschi Pass €30 (dome + campanile + baptistery + museum)
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.