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Unlocking Secrets of Cheyenne Mountain: A Military Fortress Explained Let's dive into the mysterious Cheyenne Mountain Complex! Number five: It's not just any military base—it's a fortress built deep inside a mountain. Four: This place can withstand a 30-megaton nuclear blast. Imagine that power! Three: It was the real-life inspiration for the iconic movie WarGames, housing critical defense operations. Two: In 2015, the complex began receiving upgrades to protect against electromagnetic pulses.