I've been there 3 times now. And the 3 things that surprised me were the steep grade of the street where JFK was shot. The lack of cover at the grassy knoll wooden fence, anyone would see you from behind for quite a ways....and that if you follow the zapruder film it seems like they do slow down to a crawl at the head shot, if you just film any car going by it shows the difference of not slowing down.