San Zenone Fortress – Terni
On the hills to the north-west of the city, just isolated ruins remain of the control and watchtower system made up of a series of five towers linked by city walls. It was a watchtower garrison, because the San Zenone fortress, situated at the entrance to the Serra Valley, had to be on guard over their well-trained Spoleto neighbours. The system dates back to medieval times, but it is not excluded that it was built on top of a pre-existent Umbrian settlement, the oppidum of Vindena.
Montalbano of Configni – Acquasparta
At least 1000 years of history are enclosed within this fortress. All lived intensely, from the historical events of the Abbazia di Farfa (whose possessions stretched as far as Configni in the year 1000), to the Risorgimento: in March 1831, near the Castle, a violent battle was fought between the Pontifical troops and the revolutionary militants led by Sercognani, ex Napoleonic officer. The fortress, which was under the control of Narni (1277), Boniface IX (1399), Tommaso Martani (1438), the Orsini family (1629) and finally Narni again (1708), is well-preserved. The two quadrangular towers, one of which is closed at the top by a bracketed cornice, are of relevant importance.

The Albornoz Fortress – Piediluco
A few parts remain (vast lengths of the city walls, the keep, parts of some reception rooms can be seen) in a splendid and panoramic position, dominant over the lake and the village below. Abandoned towards the end of the 18th century, the Piediluco Fortress, set at the top of Mount Luco, was built before the year 1000 as an outpost of Spoleto. In 1333 it was occupied by Roberto D’Angio’s papal troops. In 1364, it passed under the command of Blasco Fernandez, rector of the Duchy of Spoleto and cousin of Cardinal Albornoz, who had parts of the castle rebuilt: a strengthening in the consolidation of Papal power which Albornoz pursued all over Umbria. In 1368, Blasco and his son Garcia were murdered by the inhabitants of Piediluco. The reaction of Spoleto and the Church was tremendous: the fortress and the village were laid waste, and all those responsible were hung. Piediluco tried repeatedly to free itself from Papal power, favouring the expansionistic goals of Terni and Spoleto. The former extended its jurisdiction over all the lake, the latter exercised complete dominion over the Castle, at least until 1513 when it was obliged to return it to the Pope.