At the top of the grassy knoll, just behind the WPA pergola, is a spot from where assassin conspiracy buffs allege a mysterious "2nd gunman" shot President Kennedy while standing partly concealed by a board fence. Whether you believe this theory or not, it is certainly easy to see how a concealed sniper would have had a clear view of the presidential motorcade as it went past. (Scoll down to see photo taken from behind the fence looking toward Elm Street.)

This spot is easily accessible from the Sixth Floor Museum parking lot.