Vienna State Opera
The opera house was the first major building on the Vienna Ringstrasse commissioned by the Viennese "city expansion fund". Work commenced on the house in 1861 and was completed in 1869, following plans drawn up by architects August Sicard von Sicardsburg and Eduard van der Nüll. It was built in the Neo-Renaissance style by the renowned Czech architect and contractor Josef Hlávka.
Ankara Opera House
The building was originally designed by the Turkish architect Şevki Balmumcu as an exhibition center, who came first in an international competition for the project in 1933. It was later converted into an opera house by the German architect Paul Bonatz, and started serving this function on April 2, 1948.