I was suprised to know that the famous Australian symbol is not a one building!
I've been visiting Australia for study English and my school was near the Opera House. So I walked many times to a such amazing architectural building. And how much I was suprised when I saw.... 3 separated buildings!
At then navigation sign there are descriptions for these buidings:
first and the biggest is Concert Hall, second(a bit smaller) is Opera Theatre and the third one(the smallest) is a Restaurant.
By the way, the box office is located under the steps.