Re: Washington D.C.
If you're ever working at the Pentagon on a Sunday, you need to walk a few blocks to Tortoise & Hare in Crystal City. Awesome Steelers bar in DC area (well, Arlington, VA - a mile outside of DC).
I go there for a lot of games. They play Steelers fight songs, serve Iron City beer, and often have Pittsburgh-inspired grub. If you're going to check it out though - get there early!