You will be overwhelmed at the shear number of folks they have cram packed into the area. I lived there in the late 80's and back again in mid 90's when workin for Uncle Sam.
The Smithsonian is a cool place to visit in DC. The Beltway is one big traffic jam unless things have improved a bunch. Arlington cemetery is cool too. Lots of stuff to do and see. The Mall, Lincoln memorial, capital building, White House from afar, etc.
Lots of members should live around there. I lived right in Springfield too. Small world.
Don~