The City of Music, Waltzes and Cafes, Queen of The Danube, capital of the great Austro-Hungarian Empire of the 19th century and capital of today's Austrian nation, its allure is elegant, grand and refined. The heart and historical city of Vienna, the Innere Stadt, once surrounded by walls, is circled by a broad boulevard called the RingstraÃŸe and imposing buildings, monuments, and parks. These buildings include the Rathaus (town hall), the Burgtheater, the University, the Parliament, the twin museums of natural history and fine art, the Staatsoper and the former imperial palace Hofburg. The mainly Gothic Stephansdom is located at the centre of the city, on Stephansplatz. Major tourist attractions include the imperial palaces of the Hofburg and SchÃ¶nbrunn, the zoo (Tiergarten SchÃ¶nbrunn) and the Giant Ferris Wheel (Riesenrad) in the Prater. Cultural highlights include the Burgtheater, the Wiener Staatsoper and the Lipizzaner horses.