10. Cheyenne Mountain Complex
Cheyenne Mountain is home to a very real branch of the U.S. Military - the U.S. Space Force. Up until 1996, it was home to the United States Space Command and NORAD, which monitored the skies of Canada and the U.S. through a series of satellites and other early warning systems.
It was the fictional setting of Stargate Command, despite only exterior shots of the base being used for filming. In fact, as short a time as ten days before filming was due to commence, around a dozen stock shots of the base were filmed, for inclusion in the series.
These same shots were recycled for the first seven series of the show, despite their gradual degrading through use. New shots were not filmed until the eighth series, when the show moved to begin using Digital HD Cameras.
The site has become such a popular destination for tourists that the base has installed a door marked 'Stargate Command' - though it guards a broom cupboard only! (Allegedly....)