Siena peaked in 1348. The Black Death killed 60% of the population, and the city never recovered its medieval size or ambition. This catastrophe was Siena's gift to posterity: the centro storico was frozen in its Gothic prime, never rebuilt in Renaissance or Baroque style, and survives today as the most intact medieval city in Italy (UNESCO 1995). Piazza del Campo — the shell-shaped piazza that slopes toward the Palazzo Pubblico like an amphitheater — hosts the Palio (July 2 and August 16) when 10 of the 17 contrade (neighborhoods) race bareback horses around the piazza in 90 seconds of controlled insanity. The Duomo (black-and-white striped marble, Piccolomini Library with Pinturicchio frescoes, marble floor with 56 inlaid panels) was intended to be even larger — the unfinished nave extension is visible as a wall of arches next to the existing church, a monument to ambition interrupted by plague. Tuscany →
Plan my Tuscany trip →Piazza del Campo: Sit on the sloping brick surface and absorb — the Palazzo Pubblico (town hall, 1297-1310, with the Torre del Mangia — 102m, climbable, €10), the Fonte Gaia (Jacopo della Quercia fountain, copies — originals in Santa Maria della Scala). Palazzo Pubblico / Museo Civico: Simone Martini's Maestà (1315) and Ambrogio Lorenzetti's Allegory of Good and Bad Government (1338-39 — the most important secular fresco cycle of the Middle Ages). €10. Duomo: The Piccolomini Library (Pinturicchio frescoes of Pope Pius II's life — the colors are astonishing), the marble floor (56 narrative panels, partially covered — fully revealed September-October), the pulpit (Nicola Pisano, 1265-68). €5 (OPA Si Pass €15 includes all cathedral complex sites). Museo dell'Opera (next to the Duomo): Duccio's Maestà (1308-11, originally the cathedral altarpiece — the most important painting of the Sienese school). Pinacoteca Nazionale: Sienese painting from the 13th-16th century — Duccio, Simone Martini, Lorenzetti brothers, Sassetta, Giovanni di Paolo. €4. The contrade: 17 neighborhoods, each with its own church, museum, fountain, and animal symbol. The contrada museums are free and fascinating — ask at any contrada headquarters.
July 2 (Palio di Provenzano) and August 16 (Palio dell'Assunta): 10 of the 17 contrade race bareback around the Campo (3 laps, ~90 seconds). The horse can win without its rider. The emotional intensity is genuine — grown men weep, rivals embrace, the winning contrada celebrates for months. The piazza is free to enter (stand in the center from 3pm — it fills by 5pm, the race is at 7:30pm). Balcony seats: €300-1,000+. The 4 days before each Palio (trial races, contrada dinners, blessings of horses in churches) are as interesting as the race itself.
Getting there: Siena station (Florence-Siena line, 1.5h from Florence — or SITA bus from Florence, 1h15, more frequent). NO fast trains to Siena — it's a branch line. Bus is often faster. Stay: €65-140/night (centro storico — the only option). Eat: Osteria Le Logge (€35-50 — pici all'aglione, ribollita), Trattoria Papei (€25-35 — old-school Sienese). Panforte: Siena's medieval spiced fruit-nut cake — buy at Nannini (Via Banchi di Sopra). Combine with: San Gimignano (45min), Monteriggioni (15min), Chianti (20min), Val d'Orcia (1h).