Duomo di Firenze
Brunelleschi's impossible dome, still the defining shape of Florence's skyline.
The Duomo di Firenze — officially the Cattedrale di Santa Maria del Fiore — is Florence's cathedral and one of the most important buildings in the history of Western architecture. Begun in 1296 and consecrated in 1436, it dominated the medieval cityscape from the start, but its most audacious element came later: Filippo Brunelleschi's octagonal dome, completed without the use of scaffolding by any conventional method, was an engineering feat so radical that nobody fully understood how he did it for centuries. The terracotta-tiled dome remains the largest masonry dome ever built, and the cathedral's striped marble facade — white from Carrara, green from Prato, pink from Maremma — is as distinctive as any building on earth.
The complex actually encompasses several components, each requiring separate tickets or timed entry: the cathedral interior itself, the dome climb, the Campanile (Giotto's bell tower), the Baptistery of San Giovanni with its famous gilded bronze doors, the Crypt beneath the cathedral, and the Museo dell'Opera del Duomo, which houses original artworks including Ghiberti's Gates of Paradise and Michelangelo's late Pietà. Most visitors spend time moving between several of these. The dome climb — 463 steps up a narrow spiral staircase with no lift — rewards you with an extraordinary close-up of Vasari and Zuccari's Last Judgment fresco on the interior of the dome, then a panoramic terrace view over the entire city.
Entry to the cathedral interior is free, but everything else — the dome, Campanile, Baptistery, Crypt, and Museum — requires a combined ticket bought in advance. The queues to buy tickets on-site are brutal in high season, so book online before you arrive. The dome in particular sells out well ahead; if you want to climb it, treat booking as non-negotiable. Early morning slots are cooler and less crowded. The museum is genuinely underrated and often quieter than the main monuments — it's where the best original sculptures now live, having been moved indoors to protect them from the elements.
