According to
this article, Cheyenne Mountain is no longer used for NORAD. When it
was used for NORAD, there were a number of conspiracy theories revolving around the facility, but now that NORAD is gone (supposedly), the question
begs: why keep such a place open?
Google Maps Image
What I find interesting is that if you zoom out enough, you can see a trail leading from the road's termination point near 38.744846,-104.861326 to
just north of the entrance of NORAD (as shown in the Google image provided).
[edit on 15-3-2010 by Beinion]