Viļaka Castle was built by Archbishopric of Riga in 1342 as a wooden castle. At first it was closed monastery. It was rebuilt as a stone castle between 1509-1516. During Livonian war time in 1582 it was destroyed and finally demolished in 1702. The outer walls are 1.6m thick, remaining fragments of the walls are up to 2 meters high.
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.