This masterpiece of balance and taste was built for Duke Federico by architect Luciano Laurana and Francesco di Giorgio Martini from Siena. Opposite the valley, a high facade pierced by superimposed loggias gives a superb panoramic view to the west of the old town, while to the east it has a harsh yet majestic appearance. The courtyard is a model of Renaissance harmony. On the ground floor is an archaeological museum, a library for the Duke and the palace cellars.