Guise castle is a medieval fortification in the town of Guise, in northern France. Originally an early medieval wooden motte and bailey castle, it was rebuilt in stone and then massively expanded during the 12th-16th centuries. It was remodelled by Marquis de Vauban in the late 17th century to meet the advances in sIege technology then taking place. Much of the castle was reduced to rubble during the First World War and, from 1952 onwards, it has been undergoing restoration by the Club du Vieux Manoir. Nowadays it is a popular tourist site.
References: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.