Olsztynek Castle was built by Ostródan Gunter von Hohenstein, the commander of Teutonic Order, between 1349 and 1366. The brick Gothic castle was conquered by Wladyslaw II Jagiello in 1410. It was destroyed in 1656 by Tatars of Crimean Khanate and left to decay. The castle was reconstructed in 1847-1849 and moved as a school.
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.