Vienna State Opera

In the summer of 2011 my dad came to Europe for the second time and we meet in Berlin. From there we did a small trip including Vienna, one of the cities he really wanted to visit since he is in love with the classical music. I used to have a very interesting colleague at work from Vienna so based on his comments I was also very interested in visiting the city. We had a very good time there and one the plans we did was to attend a concert at the State Opera. The building was built in 1861 but restored after the Second World War.
Where & when

Vienna, Austria