The Castello Monaldeschi dominates the medieval quarter, the Upper town of Bolsena. The square castle with its corner towers is an old construction of the 12th century, which has been completely renovated and now houses the Museo Territoriale. The museum contains a lapidarium, historical hints on the vulcanic activities of the area, a prehistoric and an Etruscan section, a documentation of the ancient town of Volsinii, which can be visited at approx. 1,5 km from town on the road to Orvieto at Poggio Moscini, the Dionysian throne of the 2nd century BC, the history of the castle and various medieval remains. Bolsena gives its name to Lake Bolsena, a crater lake of central Italy, of volcanic origin. Lake Bolsena has numerous tourist establishments, particularly for nature tourism, largely in the areas of camping, agrotourism and bed and breakfasts.