1. Citadelle of Quebec
Perched on Cap Diamant, the Citadelle is the largest British-built fortress in North America and still an active military garrison. Construction began in 1820, though the site has been fortified in various ways since the 1600s. It became a National Historic Site of Canada in 1946. Today it doubles as the official residence of the Canadian monarch and the Governor General. Quebec City and Campeche, Mexico, are the only two cities in North America that kept their complete fortification walls, and the Citadelle is the crown of Quebec's defensive system. Guided tours run daily and take about an hour. Admission is 22 CAD. The tour includes the changing of the guard ceremony (summer only, usually at 10 AM), the Royal 22nd Regiment Museum, and views across the Plains of Abraham, which stretch out directly below the western walls. The Citadelle sits right next to Governors' Park, and from there you look down at the St. Lawrence and across to Lévis. Of all the things to do in Quebec City, this gives you the clearest sense of why the city mattered. The strategic position is obvious the moment you stand on the ramparts. Every army that wanted to control the St. Lawrence had to take this hill first.