Built to survive a Cold War nuclear strike, the Cheyenne Mountain Complex was once abandoned—until rising threats brought it back online. Inside this hollowed-out fortress lies a world of data, ...

The U.S. military’s mountain bunker along Colorado’s Front Range, built during the Cold War to survive a Soviet nuclear attack, now must withstand scrutiny by lawmakers who see it as a costly relic.

CNN’s Erin Burnett examines the Cheyenne Mountain Complex, a bunker buried inside a mountain similar to Iran’s Fordow nuclear site. Medicare update: Major change sparks alarm from lawmakers Most ...