This blue theater from the 18th century is the best theater for opera and ballet in town, and arguably the best in the world—a cultural force and a place to see and be seen. So many of Russia's music greats, including Tchaikovsky, premiered their masterpieces here, and it's nearly impossible to count all the ballet greats who have danced on its stage. The opera and ballet season opens in early fall and closes in August, with a break in June and July. Tickets can easily be bought online, and it's better to get them at least a month ahead of time. Usually it's only the most expensive seats that are left closer to the performance date.