Palazzo Monaldeschi
The fortress is open to visitors and offers a splendid lake view; inside, the Territorial Museum of Lake Bolsena has been set up.

The imposing Rocca was built in several phases between the 11th and 14th centuries, during the period when Bolsena was repeatedly contested between the great Orvieto families of the Monaldeschi, of the Guelph faction, and the Filippeschi, of the Ghibelline faction.
The Rocca has a trapezoidal layout and four different towers, which testify to the construction phases and the original Gothic structure. The towers are crowned with battlements and serrated corbels, while on the lower floor the remains of the fortifications commissioned by Pope Adrian IV (1154–1159) to defend Bolsena from attacks by Frederick Barbarossa are still visible.
The stone blocks used, parallelepiped in shape, come from the ancient Roman city of Volsinii. The walls of Adrian IV enclosed the castle area and the village along the Via Cassia, excluding the church of Santa Cristina, located further from the town center.
At the foot of the Rocca stands Palazzo Monaldeschi, a massive rectangular building that houses a branch of the museum, with new sections dedicated to archaeology and medieval and Renaissance ceramics.







