The Phillips Collection is housed in a beautiful brownstone building
El Greco's The Repentant St. Peter is perhaps the oldest work in the collection, dating between 1600-1605.
I forgot the name of this video installation, but it did have a hypnotizing effect on me in that small room. Check it out for yourself:
Naked Nixon, a sculpture by the famous political cartoonist Pat Oliphant
The Terrace by Pierre Bonnard
Dancers at the Bar (I can't remember the French), by Degas...of course
My favorite: Van Gogh's Road Menders