The infamous Grassy Knoll
, at Dealey Plaza
, through which John F. Kennedy's motorcade passed when he was assassinated. It's often alleged that a second gunman fired from the grassy knoll. The link here takes you to the Dealey Plaza Cam, which broadcasts a live view of the plaza and grassy knoll from the exact perch at the Sixth Floor Museum from which Lee Harvey Oswald fired at the President Kennedy.