San Martin del Castañar Castle was built in the 15th century. Now there are remains of its towers. The building, made in blocks of granite and masonry, consisted of two towers linked by a central body of rooms, protected by an approximately circular enclosure with some cubes and practicable pointed arch doors.
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.