I love DC.
I park in a long term, and then either walk or use the Metro. I think Metro is the best mass transit I've ever seen -- a world better than the tube in London, the Red Cars in San Diego, whatever they call the train in Long Beach, the 'el' (?) in Chicago, etc. Reasonable, and fast. I don't know of anyplace else with so much incredible history in so compact a space. The Air & Space museum, the Lincoln Memorial, the reflecting pond, Arlington, the wall -- I defy anyone to walk through Arlington, watch the ceremony at the Tomb of the Unknown Soldier, or walk along the surface of the wall and not be struck with the strength and solemnity of the place.