Try refreshing your browser. Government of Canada Dear Minister: There are many forts across Canada that we no longer use for military purposes including the Fortress of Louisburg in Nova Scotia, Fort Chambly in Quebec, Fort Henry in Ontario, Fort Garry in Manitoba, and Fort St. James in British Columbia. Please note that all of these forts are national historical sites, and also popular tourist destinations. People are fascinated by military history which make forts particularly popular places to visit. As you know, the most recent military fortress to be abandoned in Canada is also the best fortified. The Underground NORAD Complex is a sprawling, three-story, modern-day fortress located 600 feet below Armed Forces Base North Bay. Built to withstand a direct hit by a four-megaton nuclear blast, and protected by three 19-ton steel blast doors, it was designed to provide life support for 400 people for a month following a nuclear attack. It housed a NORAD Command Centre which protected North America from attack by the former Soviet Union. Due to its historical importance, the Complex has been designated as a “Classified Federal Heritage Building” by the National Historic Sites Directorate, Parks Canada.