Mitchel25J posted a reply:
If you have time hit up the K Street Cemetery it's worth the walk thru. Also you must go to Arlington National Cemetery as you enter going up towards The Lee house the road forks take the left fork follow it up till you come across Field Marshall Sir John Dill Monument and grave.
Feel free to ask me any question about Arlington I'm working on a book and visit it twice aweek .
Another place to visit is the Postal Museum it's near Union Station.