The Vienna State Opera is an opera house and opera company based in Vienna, Austria. The 1,709-seat Renaissance Revival venue was the first major building on the Vienna Ring Road. It was built from 1861 to 1869 following plans by August Sicard von Sicardsburg and Eduard van der Nüll, and designs by Josef Hlávka. The opera house was inaugurated as the "Vienna Court Opera" in the presence of Emperor Franz Joseph I and Empress Elisabeth of Austria. It became known by its current name after the establishment of the First Austrian Republic in 1921. The members of the Vienna Philharmonic are recruited from the Vienna State Opera’s orchestra. The building is also the home of the Vienna State Ballet, and it hosts the annual Vienna Opera Ball during the carnival season.

More details: https://en.wikipedia.org/wiki/Vienna_State_Opera