If you’re a classical music enthusiast or an opera lover, you must have been to the Covent Garden or Scala once or twice. But I discovered something that beats even the gilded interiors of Opera Garnier: the exterior. Dream big: ancient theatre with view of the volcano, a huge lake stage or a musical terrace where you can see the sun rising 315 m over the sea. Set in breathtaking outdoor locations, here are my favorite concert halls: Teatro Greco di Taormina Classical music but also rock concerts are taking place in the ancient theatre of Taormina, Sicily. A large crack in the original arena wall offers a magnificent view…