The Basilica of San Domenico is a vast brick church on a hill overlooking Siena’s historic centre. Begun in the 13th century for the Dominican order, it has the restrained exterior and spacious nave typical of Tuscan Gothic architecture. Its plain walls offer a striking contrast to the marble-clad splendour of Siena Cathedral.
The basilica is closely linked to Saint Catherine of Siena, the 14th-century mystic, writer and diplomat who worshipped here. Her head is preserved in a reliquary in the Cappella di Santa Caterina, alongside early 16th-century frescoes by Sodoma depicting episodes from her life. The church also holds important Sienese paintings, making it rewarding for visitors interested in art as well as pilgrimage.
Inside, the broad nave and muted light give San Domenico a contemplative atmosphere, often with fewer visitors than the Duomo. Outside, the area beside the church offers a memorable view across the rooftops to the cathedral. The nearby Sanctuary of Saint Catherine makes a natural companion stop.
The basilica is roughly a ten-minute walk from Piazza del Campo, though some streets along the way are steep and uneven. Entry is generally free; check opening hours ahead, as they can vary and may include a midday closure. This is an active church, so dress modestly, keep voices low and follow signs concerning photography.