The palace-fortress of the Counts Orsini is one of the most fascinating architecture of the whole southern Tuscany. Born in 1100 as a fortress of the Aldobrandeschi, passed to the Orsini family in 1313. At the end of 1700, owned by the Medici and Lorraine, became the residence of the Bishop of Sovana and then the seat of the central offices of the Diocese.The structure of the building tells centuries of history of the noble families who built and inhabited: the high tower of the keep, the elegant Renaissance inner square, the frescoed rooms newly restored, with portraits of the Orsini and the zodiac symbols are of great historical, cultural and artistic attraction.Since 1989, much of the building was converted into a museum collection of art from both the building itself that the parishes of the Diocese of Pitigliano-Sovana-Orbetello fifteenth and sixteenth century frescoes, tables and paintings of famous authors, including Guidoccio Cozzarelli, Jerome Welcome, Francesco Zuccarelli; wooden statue of the Madonna and Child by Jacopo della Quercia and interesting furnishings for liturgical worship.