Completed in 1883 for use by the Imperial and Provincial delegations, it boasts many Greek influences, from its Corinthian columns to its rich decoration (of particular note are the exterior carvings depicting the granting of the Constitution by Franz Joseph I to the 17 peoples of Austria, along with numerous marble statues and reliefs).
Another highlight is the splendid Pallas Athene Fountain with its four-meter-high statue adorned with a gilded helmet and lance, along with figures symbolizing the Rivers Danube, Inn, Elbe, and Moldau.
The current massive Opera House was built in 1869 and is notable for its French Early Renaissance style, while interior highlights include a grand staircase leading to the first floor, the Schwind Foyer (named after its paintings of famous opera scenes), and the exquisite Tea Room with its valuable tapestries.
For more than six centuries the seat of the Habsburgs - and the official residence of every Austrian ruler since 1275 - the Hofburg is perhaps the most historically significant of Vienna's palaces.
The official seat of the Austrian President, this sprawling complex consists of numerous buildings reflecting various periods, including architectural flourishes from the Gothic, Renaissance, Baroque, and Rococo movements.
The spectacular 18th-century Schönbrunn Palace (Schloss Schönbrunn) is worth visiting not only for its magnificent architecture, but also for its beautiful park-like setting.
One of Vienna's top attractions, this Baroque palace contains more than 1,441 rooms and apartments, including those once used by Empress Maria Theresa.