Jay Y.
Yelp
You may be disappointed to see nothing special at the end of the Galleria VE2 if you walk from the magnificent Duomo, but truly, how many buildings in this world can compare anyway? Besides, behind a dull facade in this unassuming plaza hides a building more historically significant than the Duomo: Teatro alla Scala, the stage for many notable opera composers and the launchpad of many world-famous opera including Madame Butterfly!
Although nowhere near as grand as many opera houses, Teatro alla Scala holds an important position in the opera history that perhaps only few opera houses can even compare. Even if you are an opera outsider, you must have heard at least an aria or two that originated from this significant theater, so how can you miss witnessing the stage where great music were born?
Of course, its fame means the show tickets are expensive and sold-out quickly, but fortunately if you do not want to commit time and money or did not plan ahead, you can pay a small admission fee of €7 during daytime to see the theater museum, which may include a view of the stage itself (ask the friendly staff first before you enter)! While the small collection of paintings and opera props is interesting, the view of the famous and beautiful stage will be worth every single cent of the small fee.
If you are in Milan for at least a day, I highly recommend seeing this significant theater, whether during an actual showing or a museum visit. Don't settle with a photo outside the plain facade where the beauty hides. Enter to witness history!
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tl;dr version:
1) Most significant opera house in the world
2) Shows expensive and often sold out, so try daytime museum
3) Must-see if in Milan for more than a day