^I went a few times before but I never got to go to the Lincoln Memorial and stand where MLK stood. I also read the entire Gettysburg Address outloud just as I did in Fallout 3.
^D.C is a usual tourist attraction and everyone also seems to wanna see New York or some major California cities. Besides that, everything else is rather scattered and the country is so big you'd barely be able to see everything you want to. I've been to New York once, Philadelphia a few times as well as DC and thats really it.
My family wants to visit New York, so that's probably where I'll go first. But I definitely also want to go to Vegas, and visit the towns nearby like Goodsprings.