The Palazzo Pretorio dominates the upper part of the ancient castle of the Counts Alberti. It is located at the bottom of one of the town’s ancient streets, today Via Boccaccio, and part of the present building volume probably belonged to the noble family’s stately edifice. The palace that can be admired today, after a long operation of recovery, corresponds roughly to the appearance assumed as the seat of the Vicariate of the Valdelsa, starting from the 15th century. The interiors were linked to different functions of the administration of justice: the exhibition itinerary crosses through the Sala delle Udienze (Hall of Audiences), the civil prison, the criminal prisons, and the chapel where the condemned spent their last night in prayer. Upstairs the itinerary continues through the vicar’s private apartments, with the splendid Sala del Vicario (Hall of the Vicar), frescoed at the end of the 15th century by Pier Francesco Fiorentino. Today the Palazzo Pretorio constitutes an integral part of the urban museum system that also includes the Casa del Boccaccio and the Museo di Arte Sacra.