With its 1,000 m of floor space , the Hall of Festivals ( '' Festsaal '' ) is the biggest hall in the whole of the Hofburg . Although built as a throne room , it was never used as such . The internal works were finished in 1923 , but the artwork remained incomplete . The hall has Alois Hans Schramm 's three ceiling paintings , dedicated to the greater glory of the Habsburgs , complete with Emperor Franz Joseph 's motto " Viribus Unitis " ( with united strength ) . The lower lunettes and octagonal panels are decorated with paintings by Eduard Veith and Viktor Stauffer of famous people from Austrian history , with Maximilian I , Charles V , Ferdinand I , Rudolph II and Ferdinand II of Tyrol to be seen in the ceiling paintings , and Leopold I , Charles VI , Prince Eugen and also the Polish King John III Sobieski in the side panels . The hall was also the venue for 1967 Eurovision Song Contest
1967 Eurovision Song Contest
Eurovision Song Contest 1967
Hofburg