Film1948
Force of Evil
The climax of this film noir plays out at the Little Red Lighthouse beneath the George Washington Bridge.
Little Red Lighthouse / Jeffrey's Hook beneath the George Washington Bridge

Wikipedia calls the lighthouse an important setting in the film’s final scenes, and On the Set of New York lists the George Washington Bridge among its New York shooting locations. A reader comment on the Washington Heights NYC site describes John Garfield finding his brother’s body on the rocks of Jeffrey’s Hook. I could not confirm from a production source that the lighthouse scenes were shot on location rather than recreated.