The organization was established on 12 May 1958 (an effect of the Cold War) as a joint command between the governments of Canada and the United States, as the North American Air Defense Command. Its main technical facility has been the Cheyenne Mountain Directorate, formerly Cheyenne Mountain Operations Center, of the Cheyenne Mtn. Air Force Station, Colorado; and for this reason NORAD is sometimes referred to as Cheyenne Mountain.
Similar to the Cheyenne Mountain Directorate, but on a smaller scale, the Canada East and Canada West Sector Air Operations Control Centres were located in an underground complex 600 feet below the surface at Canadian Forces Base (CFB) North Bay in Ontario, Canada. On 12 October 2006, NORAD operations at CFB North Bay have officially moved above ground into the newly-constructed Sergeant David L. Pitcher Building, and the underground complex has been "mothballed" but can be returned to operation if it should be needed again.
Source : text and images from Wikipedia