<Snipped quote by FalloutJack>
Thanks, and yeah, Fort Knox doesn't seem like a bad idea, though I think i'd like a bit more to go off of than just Fort Knox itself. There's lots of speculation about what exactly is still in Fort Knox, and by the metric of Fallout's resource situation pre-War, I wouldn't bet that anyone's still sitting on a gold mine.
I'll bet there's speculation. What I did for The REALLY Wild Wasteland RP was have it that the Fort Knox area retained automated (possibly malfunctioning) defense units that would include robots and on-site military turrets similar to the ones found at the Sierra Army Depot. Also a minefield, but that's to be expected. Nobody ever returns from this location, however, if they wander too far to the main gold vault. Amidst the semi-broken buildings and potential blast sites in the area, nobody's ever hit this building, it seems, and nobody's ever scoped it out too close either that's come back. The reason? Well, you're right. It
does seem like people would go after the gold, using it for official purposes or just wanting to steal it. So, anyone getting past the basic defenses would be within striking distance of finding...mainly painted bricks. Lots of them...followed by several secret passages opening and a platoon of black powersuits wielding plasma rifles.
Welcome to the Enclave's secret weapons development center, son.
This is a large secret Vault built on United States' money by the organization that would later become
known as the Enclave, the folks who secretly owned Vault-Tec, Poseidon Oil, and more while being essentially the shaodwy side of the government, pre-war. Post-war, they are a military organization of scientific levels that the Brotherhood of Steel fought so hard to not be like, but then as of Fallout 4, the BoS started going full-zealot, which I felt was following the path of Father Elijah.
But getting back to the Enclave, the story is that those that were able to pull out of their outposts in various locations around the US would gather here, under the command of a new leader who declared that "The old Enclave is dead. Long live the new Enclave.", and proceeded to operate a new organization which was going to be far more tactically sound and using the old head-brain properly to handle matters. The new leader, a black-and-red powersuited figure known only as Number One, has had some years to expand his limited amount of troops and to outfit those under his command.
I can give you alot more details than that (Categories of troops, weapons, vehicles, etc.) upon the asking.