Vienna (German: Wien) is the federal capital of Austria, located in the heart of Europe. Vienna, with a population of about 1.9 million, is the cultural, economic, and political center of Austria. 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 psychoanalyst - Sigmund Freud. The historic center of Vienna is rich in architectural ensembles, including Baroque castles and parks. Vienna is known for its high quality of life. Vienna regulary hosts urban planning conferences and is often used as a case study by urban planners.