This Romanesque church redesigned by Vasari has a Pisan Romanesque façade and a bell tower, the name of which means "a hundred holes" (on account of its 80 gemeled windows). You will want to cast your gaze over the symbols of the 12 months of the year that decorate the archivolt of the central portal with particular verve. Inside, the numerous works of art are sure to catch your eye, including a remarkable polyptych by Pietro Lorenzetti.