Found via Market Folly.
FORTUNE -- Sshh! Don't look suspicious. Keep your head down. We're on our way to a really secret organization in suburban Virginia just outside Washington, D.C. As we drive along Dolley Madison Boulevard, don't bother looking at the razor wire, tall gates, and armed guards on the right. Everybody knows that's CIA headquarters -- there's a marked sign out front (and a gift shop inside, at least for employees). No, we're going a couple more miles and hanging a left until we reach a squat, rust-colored two-story building with meager windows, a PRIVATE PROPERTY sign, no identification, and all the character of a brick storage shed. The front door is locked. Some locals have called the place the Kremlin. In the upstairs reception area, you'll see half-a-dozen portraits of the owners and their relatives. Admire them if you like, but taking photos of the portraits is strictly prohibited.