"Visit the Hofburg: The Center of Imperial Austria Up until the end of World War I in 1918, the Hofburg was the center of the Habsburg dynasty and the Austro-Hungarian Empire. The massive complex includes the Österreichische Nationalbibliothek (National Library), Schatzkammer (Imperial Treasury), and, the most recent addition, the Neue Burg, completed in 1913. A visit should include the Imperial Apartments, each lavishly decorated in Baroque and Rococo styles, and the Sisi Museum, covering the life of Austria's beloved (and actually Bavarian) Empress. It is also the official seat of the president of Austria ."