Fort Knox, United States
There’s a reason why the saying “harder to get into than Fort Knox” exists. This military base, located in Kentucky, is absolutely impossible to get into. It’s been used for many things over the course of America’s history, but today it is where America’s gold is held.
The fort was only opened one time for media and Congress in 1974, and it hasn’t been opened since. In order to get to America’s gold you’d have to cross minefields, electric fences, cameras, armed guards, and barbed wire. Oh, and don’t forget the Apache helicopters that are ready to go at a moment’s notice.