The most significant monument of Certaldo is the Palazzo Pretorio or Vicario, built in the twelfth century. and residence of the Counts Alberti, then expanded and modified to accommodate the functions of the Vicariate (such as the hall of hearings, the prisons, the archive, the chapel, in addition to housing). On the facade and in many coats of marble, paintings and earthenware school Robbia. In the adjoining building and, now deconsecrated church of SS. Thomas and Prospero (the oldest, the first XIII sec.) You can admire the frescoes and sinopie XV and XVI., Including, in "the room of strangers", a Madonna and Child Enthroned by Pier Francesco Fiorentino and, in church, the rich Tabernacle of justice of Benozzo Gozzoli and Giusto D'Andrea.