I've always seen shots of the Washington Metro stations in B&W, but I'm a color photographer and thought that would make an interesting scene.
Mel-
I've lived in DC (and now, 35 miles out) for 17 years and I don't think I've ever attempted as many images of the city (protests aside) as you have. Maybe I just take it for granted, and clearly that's a mistake.
Here's an older one (you can guess the date) showing my usual DC fare, on Ilford XP2 from a Contax G2 and 21mm Biogon: