Diefenbunker: Canada's Cold War Museum

The Diefenbunker, formerly known by its military designation, Canadian Forces Station Carp, is a large underground four-storey reinforced concrete bunker and nuclear fallout shelter located in the rural area of Carp, Ontario approximately 30 km west of downtown Ottawa. Between 1957 and 1961, during the Cold War the Government of Canada led by then Prime Minister John Diefenbaker authorized the Diefenbunker to be designed and built as the Central Emergency Government Headquarters in an attempt to ensure the continuity of government subsequent to a nuclear weapons attack by the Soviet Union.

Source: Wikipedia