The Lincoln Memorial hovers over its mirror image in the reflecting pool on the National Mall. This is perhaps not as dramatic as the reflection of the Washington Monument, but it was taken just minutes later and so retains some of the same atmosphere. I also liked the photo at right in which the Lincoln Memorial turned out much darker but features lines I like in the foreground w/the sidewalk turning nicely toward the Memorial. Again, I think this would have been cooler if I was 5 steps to the right so the sidewalk would have lined up better with the Memorial, but again, no tripod at the time.
Speaking of the reflection of the Washington Monument, that photo climbed to top-40 on Flickr interestingness for yesterday, which was awesome to see. It has now fallen to around top-75, but it's still just nice to see that people like it.