Vienna is a place.
Vienna . 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 . Vienna is host to many major international organizations , including the United Nations and OPEC . 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 .