I grew up about 10 mins outside of D.C. I think i've actually gone to take photos of it only this one time. These are photos of the Capital Building, the Washington Monument, and the White House. They are all within a short walk from each other. On the lawn (where the Capital Building and the Monument are), there are many really great museums/galleries that are constantly changing.
The Natural History Museum, The Air and Space Museum, The Holocaust Museum, The Smithsonian, The National Gallery of Art, and The Spy Museum are all definitely worth checking out! :)