It stands enchantingly in the center of the village, surrounded by a large water moat, and contains, as a precious pearl, one of the masterpieces of Italian mannerism, the small room painted by Parmigianino in 1524 with the myth of Diana and Actaeon. Still intact is the the noble apartment of the Sanvitale family, counts who kept it until 1948, with furniture and furnishings from the sixteenth, seventeenth, eighteenth and nineteenth centuries, portraits of various members of the family, frescoes and paintings by Felice Boselli and, like the castellans of the past , from the "Optical Room", thanks to an ingenious system of lenses and prisms, you can still snoop, while secretly hidden, on the life of the square.