A Cold War nuclear bunker is buried deep inside a Colorado mountain. See inside the Cheyenne Mountain Complex.

Tech Insider : Politics, Business
COLORADO SPRINGS, CO - MAY 11: At the entrance to the Cheyenne Mountain Complex headquarters for NORAD a military shuttle bus exits the mountain May 11, 2004 in Colorado Springs, Colorado. Constructed during the Cold War period in 1958, NORAD (North American Aerospace Command) was responsible for external air, missile and space defense.
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