Fort Hoofddijk was built in 1879 as one of the fortifications around Utrecht that formed part of the Nieuwe Hollandse Waterlinie, or 'New Dutch waterline'. This defense line made use of inundating parts of Holland to stop the advance of the enemy, but because Utrecht was on relatively high ground, it needed an additional ring of fortifications.
Today the Botanical Gardens of Utrecht University are located at the fortress site. It’s a beautiful place for a long walk along rare species of plants and flowers.
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.