Atwingo, I visited IAD on Sep 1, purely for spotting. After staying inside for a few hours I drove around the perimeter, but could not find a place to spot. There is an employee parking lot near Atlantic Coast hangar which I believe is next to a taxiway. Of course, the rules have all changed now. If aircraft are landing from the north in the afternoon sunlight, picturesmay be possible from the daily parking lots. I can't be sure because aircraft were landing in the opposite direction the day I was there. Happy spotting.