The Citadelle of Quebec, known as La Citadelle, is a vital piece of Canada's military history and a key tourist attraction in Quebec City. As an active military installation, it is the secondary official residence of the Governor General of Canada. Built between 1820 and 1850, this historic site is one of the largest fortresses in North America. It offers guided tours that delve into its rich heritage, including the famous Changing of the Guard ceremony during the summer months.