[SteveR]

If you drive, there's a short cut around most of the traffic. From NJ, Turnpike to 95 south. Once you get about 10 miles north of Baltimore, then take I think it's 895 south, then 295 south, then the Baltimore Washington Parkway, then 350 south. You'll go around most of the traffic routes and end up on 350 right by the FBI Headquarters and Lincoln Memorial. If you stay on 350 you'll cross over the river and end up at the Pentagon.