If you've got a hankering for some mental stimulation, make a trip to Department of the Interior Museum. Whether it's history, culture or traditions, you'll find plenty of fascinating displays to keep your mind active here.
You'll have sightseeing choices galore in Northwest. Department of the Interior Museum is an ideal place to begin here, but there are loads of other interesting spots to consider. White House, Arlington National Cemetery, and Lincoln Memorial are near the collection of historical artifacts and and will cap off your day nicely.