Philadelphia's Academy of Music is both a celebrated historical landmark and a current focus of cultural life in the city. Opened in 1857, the Academy is the oldest grand opera house in the United States still used for its original purpose. It remains one of the busiest halls in the world and hosts a myriad of community functions and cultural activities, including performances by the Opera Company of Philadelphia and the Pennsylvania Ballet. The Academy is owned by The Philadelphia Orchestra Association and is managed by the Kimmel Center for the Performing Arts. The main hall is constantly in use for concerts, operas, ballets, and other events. The Ballroom was inspired by the design of the Hall of Mirrors at Versailles.