Charles Garnier's 1875 opera house holds 1,979 seats across five tiers, each level engineered for sightlines that favor the choreography over the proscenium. The Grand Foyer stretches 154 meters, its gilt mirrors and ceiling frescoes designed to showcase interval promenades as part of the performance ritual itself. When Marc Chagall's 220-square-meter ceiling was installed in 1964, critics argued the modernist canvas clashed with Garnier's Second Empire ornament; today it frames every ballet under a canopy of flying lovers and Parisian rooftops. The Ballet de l'Opéra de Paris maintains a repertoire spanning Petipa, Balanchine, and contemporary European choreographers. Paris Opera Ballet tickets open access to productions mounted on the original 600-square-meter stage, where hydraulic lifts and trap systems date to the 19th century. The orchestra pit accommodates 110 musicians beneath a cantilevered overhang that projects sound into the lower tiers without amplification. Box seats along the horseshoe tiers offer partial sightlines but place you within arm's reach of Garnier's rosso antico marble columns and bronze caryatids. Outside performance nights, self-guided visits traverse the Grand Staircase, the foyer, and select auditorium viewpoints. The adjacent Bibliothèque-Musée displays costume archives, set maquettes, and Edgar Degas sketches that documented corps rehearsals in the 1870s. Guided tours access the underground lake—a 2.5-meter-deep reservoir stabilizing the foundation—and backstage corridors lined with dressing rooms still bearing dancers' nameplates from decades past. Advance reservations secure both performance seats and daytime entry; day-of availability contracts sharply during the September-to-July season, when the company mounts 180 performances annually.