Prudnik Castle was located in the defensive bend of the Prudnik river. It was built in 1255. It was founded a Czech knight Wok of Rosenberg.
The castle was destroyed in 1428 by the Hussites. After the end of the first Silesian War, Frederick the Great rebuilt the castle.
A fire on 27 August 1806 burnt the entire castle except of one tower called 'Wok's Tower', which is now the only remnant of the castle.
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The Citadelle of Quebec is an active military installation and official residence of both the Canadian monarch and the Governor General of Canada. It is located atop Cap Diamant, adjoining the Plains of Abraham in Quebec City. The citadel is the oldest military building in Canada, and forms part of the fortifications of Quebec City, which is one of only two cities in North America still surrounded by fortifications, the other being Campeche, Mexico.
The first fortifications in Quebec were built by the Governor General of New France Louis de Buade, and completed just in time for the Battle of Quebec in 1690.
After the British conquest in the second half of the 18th century, the problem of Quebec City's defences grew more acute.