Main and Elm Streets of Dallas. White concrete pergola where Abraham Zapruder filmed the assassination is at the far right of the scene, with Grassy Knoll to the left of it. JFK was struck by the final bullet at a position just to the photo-left of the lamp-post in front of the pergola. The "triple underpass" is in the photo center.
Slightly cropped version
Version cropped to show pergola and place where Zapruder was
Howard Brennan sitting across the street from the Texas School Book Depository
Looking in the opposite direction of the white pergola building, an X on the street marks the position of JFK during the final shot