Commissioned by Napoléon III, the Paris Opera House’s ornate 19th-century interiors including the Grand Staircase and 500-foot-long Grand Foyer lined with chandeliers easily rivals the extravagance of Versailles. For a unique, behind-the-scenes visit, luxury concierge Your Paris Experience can arrange a tour of the rehearsal room where the dancers stretch and warm up before performances and the underground water reservoir immortalized in Gaston Leroux’s Phantom of the Opéra. The 1½-hour-long event ends with a glass of Champagne as you watch people arrive for a performance. Plan far enough in advance and you may be able to secure tickets to a show like the upcoming George Balanchine evening, in which three abstract Balanchine ballets, one with sets and costumes dreamed up by Karl Lagerfeld, will be performed. Contact email@example.com or 33/6-19-24-59-53; yourparisexperience.com.