Do you hear it? Do you see it? The Phantom of the Opera is there! Known as one of the most famous opera houses in the world, it was also the setting for Gaston Leroux’s 1910 novel, The Phantom of the Opera. Today, the Palais Garnier is used more for the Paris ballet so if booking tickets to an opera is on your list, check out Opera Bastille. Tours around the Opera house take place daily.