The Piazza del Campo is the city's main public space, constructed in an amphitheatrical semi-circle at the meeting point of the three hills on which Siena is built. The Palio horse race is run here.
Il Duomo (Cathedral) is a superb example of Italian romanesque architecture.
The Sala della Pace (the Hall of the Nine) in the Palazzo Pubblico houses Sienese maestro Ambrogio Lorenzetti's series of frescos Allegory of Good Government and Allegory of Bad Government and its Effects on Town and Country, painted in the early 12th Century. Next to the Palazzo Publico is the brick Torre del Mangia, 88 meters and 400 steps high, that affords a breathtaking view of the city and countryside.