I remember getting a tour of the Washington D.C. FBI building way back in the, well, way way back. At the time I actually just needed a comfort station and a tour went along with it, but it was worth it. If you’re in Washington D.C., and there isn’t a government shutdown, add it to your long list of other excellent places to see in the nation’s capital.
(I don’t know if the FBI tour is still any good (just as you can be darn sure the Hershey Chocolate Factory tour isn’t like the excellent ones we had back in the day when they still gave out free chocolate samples and you could practically peer into the chocolate vats), but maybe the FBI tour is holding its own. Of course, chocolate bar recipes might be bigger and better secrets than those the FBI covets.)