Ft. Knox. I've had a Guardian 600 for many years. It is not indestructible but it sure seems like it is. Very heavy, very good looking, great quality, long gun racks and shelves for handguns and handgun racks, ammo, optics, or other valuables. It takes several people and heavy equipment to move it. Ft. Knox safes are expensive but not as expensive as the guns and optics it protects.