Where is the location of the phantom of the opera?

The Phantom of the Opera is primarily set in the Palais Garnier, the famous Opera house in Paris, France. The story revolves around the mysterious figure known as the Phantom, who lives in the catacombs beneath the opera house and becomes infatuated with a young soprano named Christine Daaé. The lavish and eerie atmosphere of the opera house plays a crucial role in the narrative, enhancing the themes of passion and obsession.