Vienna State Opera
Here is some of the detail in the magnicifant Vienna Opera House. While I did not manage to see a show, I did have the opportunity to visit the auditorium and entertainment rooms.
Every night they put on a different production, which includes all costumes and sets. This means that if you are in Vienna, you can see a different opera every night.
Here is just a sample of the wonderful interior.
The balconies with the royal box in the middle
The royal box