Vienna is a city.
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 . The city is located in the eastern part of Austria and is close to the borders of the Czech Republic , Slovakia , and Hungary . The UN-Habitat has classified Vienna as being the most prosperous city in the world in 2012/2013 .