Palmanova is a town in northeastern Italy and an excellent example of star fort of the Late Renaissance, built up by the Venetians in 1593.
Palmanova was built following the ideals of a utopia. It is a concentric city with the form of a star, with three nine-sided ring roads intersecting in the main military radiating streets. It was built at the end of the 16th century by the Venetian Republic which was, at the time, a major center of trade. It is actually considered to be a fort, or citadel, because the military architect Giulio Savorgnan designed it to be a Venetian military station on the eastern frontier as protection from the Ottoman Empire.
Between the points of the star, ramparts protruded so that the points could defend each other. A moat surrounded the town, and three large, guarded gates allowed entry. The construction of the first circle, with a total circumference of 7 kilometres, took 30 years.
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.