The so-called Powder Tower (Kruttornet) is the oldest monument in Visby. It was built in the 12th century to protect the harbour. There was initially no door in the tower, but only a small entrance in 10 meters high. Defenders used ladders to climb up to the entrance. Today 25 meter high tower is open to the public in summer season.
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.