In Monaco are the Roman Catholic cathedral, the prince's Genoese and Renaissance palace, and the Oceanographic Museum of Monaco, built in 1910. The casino itself contains a theatre designed by the 19th-century French architect Charles Garnier, which is the home of the Opera de Monte Carlo. During the 1920s many of the works of the famous Ballets Russes of Sergey Diaghilev were given their premiers there. There is also a Monte-Carlo national orchestra. The best known of the automobile events held in the principality are the Monte-Carlo Rally and the Grand Prix de Monaco. Pop. (1995 est.) 30,400.