Because of ongoing threats, the Cheyenne Mountain complex is a 24/7 operation and can go into lockdown mode at a moment’s notice. The facility is a completely self-sufficient city inside a mountain.

Inside America's fortress defending the U.S. in outer space 04:23. Deep inside a cave, a military base in Colorado's Cheyenne Mountain plays a critical role in the mission to protect America and ...

CNN’s Erin Burnett examines the Cheyenne Mountain Complex, a bunker buried inside a mountain similar to Iran’s Fordow nuclear site.

EL PASO COUNTY — FOX31 is getting a rare look inside one of the most secure, classified military installations on the planet. A nuclear bomb-proof bunker nestled inside a Colorado mountain. … ...

COLORADO SPRINGS, Colo. (CBS4) - The tunnel to the Air Force station inside Cheyenne Mountain is iconic. For 60 years, North American Aerospace Defense Command in Colorado Springs has been ...

Just south of Colorado Springs is one of the most famous military bases in the world, but you can’t see it. It sits one mile inside of the granite Cheyenne Mountain, 2,000 feet down from the ...

The Cheyenne Mountain Complex, the alternate command center for the North American Aerospace Defense command (NORAD), has captured the imagination of storytellers since it was constructed in the ...

The U.S. military’s mountain bunker along Colorado’s Front Range, built during the Cold War inside Cheyenne Mountain to house NORAD and survive Soviet nuclear attack, faces scrutiny as a ...

The Cheyenne Mountain Complex was built during the Cold War and was designed to withstand nuclear, electromagnetic, and ...