 in France  called Academie Nationale de Musique or Palais de Garnier. All the  backstage area, Grand Staircase, dressing rooms, even the cellars  (with the exception of the auditorium, boxes, and the "lagoon") were  all shot on location at the Palais de Garnier. The "lagoon" was the  ONLY film set used for the film. The boxes and auditorium were  another theatre.