Vienna, located on the Danube River, is the largest city and political center in Austria. It has won the reputation of the capital of architecture for its various architectural styles. It has a long history as the capital of culture, and is known as the most livable city in the world for its exquisite decoration. Vienna's most famous Graben Avenue, Graben Avenue, is called Graben Avenue. Shaped like a U word, known as the golden U word, is one of the world's top ten famous pedestrian streets.