I think it's kind of ironic that with all the things to see in DC, one of the best places to take pictures is in its subway. It's like when they designed it they wanted to give photographers a perspective playground.
I like the shot for the most part. I think a wider aspect ratio would give it more a sense of space. I also tend to think the contrast is a little too intense for my eyes. There's a lot of white space in it. Overall though, a nice example of perspective.