Santo Stefano d'Aveto Castle controlled the roads from the Apennines to Emilia. It was probably built int the 12th century, first time documented in 1164.
The castle that presents itself now is an interesting pentagonal structure with ramparts on four of the five perimetral corners. In ancient times the arms square could be reached, an area onto which the different rooms on the ground floor open, using drawbridges that were easy to lift in case of attacks.
References:The Château du Lude is one of the many great châteaux of the Loire Valley in France. Le Lude is the most northerly château of the Loire Valley and one of the last important historic castles in France, still inhabited by the same family for the last 260 years. The château is testimony to four centuries of French architecture, as a stronghold transformed into an elegant house during the Renaissance and the 18th century. The monument is located in the valley of Le Loir. Its gardens have evolved throughout the centuries.