The Cheyenne Mountain Complex is a highly secure military installation located inside Cheyenne Mountain in El Paso County, Colorado. Operated by the United States Department of Defense, this deep underground facility serves as an alternate command center for the North American Aerospace Defense Command (NORAD) and the United States Northern Command (USNORTHCOM). The complex was designed to withstand nuclear attacks and electromagnetic pulses, featuring massive blast doors and sophisticated life support systems.
It remains one of the most iconic examples of Cold War-era military engineering and continues to play a vital role in national defense operations.