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4 of 23 from Photos: Inside Cheyenne Mountain, America's Fortress
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A wide view of Cheyenne Mountain and the famous tunnel that leads to the military installation, which is secured under 2,000 feet of granite.
Click here for the entire Road Trip 2009 package.
June 27, 2009 6:00 AM PDT
Photo by: Daniel Terdiman/CNET
