Unlike NY and a lot of other cities, DC is "down to earth" and made for living. Besides the obvious historical and capital reasons to visit, it is a wonderful city to walk and get around giving you the ability to see a lot in a short amount of time. We have the best museums as a whole in the US and maybe world, almost all being free (including the zoo), the White House, capital, Georgetown, Mt. Vernon (George Washington's Home), monuments, etc all easily accessible by public transportation and Metro! Bethesda (right outside of DC) has something like 200+ restaurants on top of it all. Def worth a stop....