13. Titan I Missile Silo: USA
The first intercontinental ballistic missiles (ICBMs), the very missiles North Korea is trying to perfect at this moment, were the Titan I missiles. Three silos housed the missiles at one time. The U.S. replaced the Titan I with the Titan II, of course, and the Titan I quickly became such a relic, the U.S. had to retire the missiles from service. The military recycled the parts from the missiles, but the silos remain as a testament to the Cold War. In the event that North Korea figures out ICBMs, finding a way into one of these silos would be a good idea. In addition to rust, they feature water treatments facilities, air cleaning systems, and enough food to last a few nuclear winters.