Capital of Austria, on the river Danube at the foot of the Wiener Wald (Vienna Woods); population (1986) 1,481,000. Industries include engineering and the production of electrical goods and precision instruments. The United Nations city 1979 houses the United Nations Industrial Development Organization (UNIDO) and the International Atomic Energy Agency (IAEA). features Renaissance and baroque architecture; the Hofburg (former imperial palace); the 18th-century royal palaces of Schonbrunn and Belvedere, with formal gardens; the Steiner house 1910 by Adolf Loos; and several notable collections of paintings. Vienna is known for its theatre and opera. Sigmund Freud's home is a museum, and there is a university 1365. history Vienna was the capital of the Austro-Hungarian Empire 1278-1918 and the commercial centre of E Europe. The old city walls were replaced by a wide street, the Ringstrasse, 1860. After much destruction in World War II the city was divided into US, British, French, and Soviet occupation zones 1945-55. Vienna is associated with J Strauss waltzes, as well as the music of Haydn, Mozart, Beethoven, and Schubert and the development of atonal music. Also figuring in Vienna's cultural history were the Vienna Sezession group of painters, the philosophical Vienna Circle, and the origins of psychoanalysis originated here.