Cheyenne Mountain Complex (NORAD)

The Cheyenne Mountain Complex transitioned to a standby status in 2006 when NORAD's primary command center operations moved to Peterson Air Force Base (now Peterson Space Force Base). However, the complex was reactivated for certain functions and continues to serve as an alternate command center, with its systems maintained for operational readiness.

The main operations center of the Cheyenne Mountain Complex is excavated approximately 2,000 feet into the granite of Cheyenne Mountain in Colorado. The facility's buildings are mounted on massive steel springs designed to absorb the shock of a nuclear detonation, and the complex is protected by blast doors weighing approximately 25 tons each.

The complex was engineered during the Cold War to withstand a nuclear weapon detonation in close proximity to the mountain, with its granite overburden, blast doors, and spring-mounted buildings designed to absorb significant shock. It was also designed to operate with self-contained power, water, and air filtration systems for extended periods in the event of a biological, chemical, or nuclear emergency.

No, the Cheyenne Mountain Complex is an active military installation and is not open to the general public for tours. Unlike some other decommissioned Cold War facilities that have become museums, Cheyenne Mountain remains a classified operational facility under the United States Space Force.