Oh, and as for the subject of the thread, my most memorable place was the site of the Oklahoma City bombing. I was there not too long after the public was first allowed onto the site, when all the stuffed animals, photos, toys, and other stuff filled the chain link fence that surrounded the site.
The rubble was still around and the street was still stained and blackened. It was a surreal experience, and as I drove away and got about ten minutes away, I realized that major life experience had just occurred. I turned around and went back and stayed another hour or longer, just standing there taking it in and trying realize what had happened on the very spot I was standing.
Other than that, I guess it would be all the stuff in DC.
Want to go to Dealy Plaza in Dallas, the Lorraine Motel in Memphis, among other places.