1. Royal Opera House, Covent Garden? Paris Brussels Amsterdam London

2. Teatro La Fenice? Rome Paris Milan Venice

3. Teatro dell'Opera? Venice Monte Carlo Berlin Rome

4. Opera de ____ Bastille? Versailles Monte Carlo Paris Venice

5. Gran Teatre del Liceu? London Paris Barcelona Milan

6. Theatre Royal de la Monnaie? Paris Brussels Monte carlo Rome

7. Teatro alla Scala? Rome Milan Paris Venice

8. Teatro Communale? Florence Parma Paris Sicily

9. Det Kongelige Teater (now known as Gamle Scene)? Copenhagen Cologne Berlin Parma

10. Staatsoper Wien? Berlin Vienna Cologne Stockholm