QUOTE (HickoryHuskers @ May 3, 2016 -> 12:30 PM)
Don't know how long you'll be there, and I don't know what your interest is, but these are always my top recommendations:
Holocaust Museum
National Museum of American History
Arlington National Cemetery
Lincoln Memorial
Vietnam and WWII Memorials
National Air and Space Museum
Bureau of Printing and Engraving
QUOTE (shysocks @ May 3, 2016 -> 12:34 PM)
It's obvious, but absolutely go to the Air and Space Museum. Also go to the Udvar-Hazy Center, which is an additional "wing" of the Air and Space Museum but a little outside of town. It has a space shuttle. The shuttle's real big. It also has the Enola Gay, which is extremely cool for history buffs.
These are above and beyond the other attractions to me.
Cool, thank you both for the suggestion. I'll definitely try to go to a few of those places for sure.