Vienna is the capital and largest city of Austria and one of the nine states of Austria. Apart from being regarded as the City of Music because of its musical legacy, Vienna is also said to be "The City of Dreams" because it was home to the world's first psycho-analyst – Sigmund Freud. Major tourist attractions include the imperial palaces of the Hofburg and Schönbrunn (also home to the world's oldest zoo, Tiergarten Schönbrunn) and the Riesenrad in the Prater. Cultural highlights include the Burgtheater, the Wiener Staatsoper, the Lipizzaner horses at the spanische Hofreitschule, and the Vienna Boys' Choir, as well as excursions to Vienna's Heurigen district Döbling. There are also more than 100 art museums, which together attract over eight million visitors per year. The most popular ones are Albertina, Belvedere, Leopold Museum in the Museumsquartier, KunstHausWien, Bank Austria Kunstforum, the twin Kunsthistorisches Museum and Naturhistorisches Museum, and the Technisches Museum Wien, each of which receives over a quarter of a million visitors per year.
There are many popular sites associated with composers who lived in Vienna including Beethoven's various residences and grave at Zentralfriedhof (Central Cemetery) which is the largest cemetery in Vienna and the burial site of many famous people. Mozart has a memorial grave at the Habsburg gardens and at St. Marx cemetery (where his grave was lost). Vienna's many churches also draw large crowds, famous of which are St. Stephen's Cathedral, the Deutschordenskirche, the Jesuitenkirche, the Karlskirche, the Peterskirche, Maria am Gestade, the Minoritenkirche, the Ruprechtskirche, the Schottenkirche, St. Ulrich and the Votivkirche. Modern attractions include the Hundertwasserhaus, the United Nations headquarters and the view from the Donauturm.