This Romanesque Church topped by the campanile of "a hundred holes" (a name justified by its 40 gemeled windows), has a Pisan-style façade. You are sure to admire the symbols of the twelve months of the year that decorate the archivolt of the central portal with particular verve. The interior is dominated by two marble low-relief (one of which is of a Byzantine style Epiphany) and a remarkable polyptych by Pietro Lorenzetti.