Considering almost every museum in DC is free, you might not think to check out the Phillips Collection in Dupont Circle, but it shouldn't be missed. The museum is in a mansion, similar to the Barnes Collection outside of Philadelphia except the building is not quite as extravagant, and the art is all approachable and intimate. There is usually a visiting exhibit, almost all of reknowned artists, but be careful, the place can get packed on weekends.
more