Don't skip Arlington when you go to DC!!!
I was just in DC for the gazillionth time and decided to stay in Arlington for two nights. So glad I did. Not only did I get to tour Mount Vernon House and the famous cemetary, but there are all sorts of wonderful historic churches and streets to explore in the historic center of Arlington. Pluse great food (we loved Water and Wall; great gourmet American food). I can't urge everyone enough to get out of DC and see the surrounding area too.