It looked pretty cool. I pulled over and walked over to take some photos. Since it's raining right now, I guess that's a good enough excuse to post them.
The full set is here: Washington Monument on a Rainy Night, 11/13/08
Since I didn't have a tripod, I propped the camera against my shoe and hit the self-timer. My head accidentally got in the way of a couple of pics, so I decided to do one with me in it on purpose: