In this house lived the 14th-century mystic who is one of the principal patron saints of Italy. If you are a devotee, it is natural to combine a visit here with a visit to San Domenico, but even if you are not a devotee, if you have the time, you are likely to find your visit interesting.
© OpenStreetMap contributors
Tolomei Palace
This lovely palazzo was built between 1205 and 1212 by the Tolomei family when the area was outside of the city walls. Now, it is well within the walls and on the way from the Campo to Piazza Salimbeni.
Salimbeni Palace
This medieval fountain is the oldest in Siena, built in its current form in 1246. It is the original, not a replica. Not surprisingly, it is somewhat worn and overgrown in places, but still impressive and beautiful, and would be a top sight in most other cities.
This large, austere Gothic basilica (usually simply called San Domenico) is not only dedicated to St. Catherine of Siena, along with St. Dominic, but was frequented by her and contains a period portrait of her by Andrea Vanni and relics including her head. It also features several other works by Sienese Gothic painters and impressively high vaulted ceilings. It is quite close to the long-distance bus stop, so if you are going to or from Siena by bus and have the time even to briefly enter this house of prayer, do.
This medieval hospital, now a museum, is chock-full of medieval art including altarpieces by Bartolommeo Bulgarini and frescoes by the Lorenzetti brothers and Simone Martini. Also part of the complex (no additional admission charge) is the Museo Archeologico Nazionale, which exhibits some important archeological finds from the area, plus items from public and private collections of antiquities that are mostly from Siena and Chiusi.
Sansedoni Palace
Opposite the Palazzo Pubblico, it is another beautiful Gothic building on the Campo.