The slender brick-and-stone bell tower that rises 102 metres from the Palazzo Pubblico, one of the tallest medieval towers in Italy. The climb — 400 narrow steps — leads to a stone gallery with panoramic views over the red-roofed city, the Duomo, and the Tuscan countryside beyond. Numbers inside are limited so on busy days expect a wait.
Built between 1325 and 1348, just before the Black Death halted Siena's expansion. Tickets bought at the Museo Civico in the Palazzo Pubblico cover both attractions.