No matter where you are, and no matter when you have time, you need to plan a trip to Washington.
Some sights do require tickets or reservations, but can usually be arranged fairly easily.
Then of course there are all of the Smithsonians . Heck, there are tons of them all in the downtown area. I haven't even been through all of them except those I mentioned above. You will need time to see everything, so give yourself as long as you can. All photos and information on this site are Copyright 1986-2000 by Walt Reiss, CoasterQuest and may not be reproduced or transmitted by any means without the written consent of the copyright owner.