Use the front door.
Finding any location in the downtown DC area in fallout 3 involves traveling through one or more of the underground metro stations. It all depends on what locations you have already discovered. The closest place to the national archives would be the Museum of History. Fast travel there and head east (and slightly north) if you havent found the museum of history, take the Anacostia crossing station just north of rivet city to the Museum station exit. ReapTheChaos 22:15, January 29, 2010 (UTC)