Sitting atop this is Québec's star-shaped Citadel, a massive fortress protected by thick walls, ramparts, and ditches that was built in 1832. The Citadel is used as a military quarter for generals, officers, and servicemen, as well as as the summer residence of the Governor General of Canada. it is the largest British-built fortress in North America; it took 30 years to construct. This military site has been active since 1850 when it housed British troops and the British artillery.
Its walls enclose 300 years of history from the New France period to today. Known as "the Gibraltar of the Americas" on account of its strategic location and breathtaking view of the city and the St. Lawrence River. Summer visitors can watch the Changing of the Guard ceremony each morning, and the military museum, located in the mid-18th-century powder magazine in the southern corner of the Citadel, is open year-round.
Admission costs CA$18 for adults. The admission fee includes access to the museum exhibits.