What is the capital of Austria?

Vienna is the capital and largest city of Austria, and one of the nine states of Austria. Vienna is Austria's primary city, with a population of about 1.8 million, (2.6 million within the metropolitan area,[ nearly one third of Austria's population), and its cultural, economic, and political center. It is the 7th-largest city by population within city limits in the European Union. Until the beginning of the 20th century it was the largest German-speaking city in the world, and before the splitting of the Austro-Hungarian Empire in World War I, the city had 2 million inhabitants. Today it has the second largest number of German speakers after Berlin.Vienna is host to many major international organizations, including the United Nations and OPEC. In 2001, the city center was designated a UNESCO World Heritage Site.