I think you can spend 3 days in the B'more/DC region andl see and do a lot of pretty cool stuff....and the public transport is really nice...if you plan it right, you can stay in the same hotel, and not drive in either of those cities.
I'm also a big fan of Chicago, New Mexico, Salt Lake, San Fransisco, the UP, Savanah Georgia, and Austin Texas
I'm also a big fan of Chicago, New Mexico, Salt Lake, San Fransisco, the UP, Savanah Georgia, and Austin Texas