Vienna is seat to a number of United Nations offices and various international institutions and companies, including the United Nations Industrial Development Organization (UNIDO), the Organization of Petroleum Exporting Countries (OPEC), and the International Atomic Energy Agency (IAEA).

Vienna, the capital city of Austria is a majestic city with massive traditional buildings and gleaming modern edifices. There is the “Old Vienna", the Vienna of Emperors, Empresses and Strauss and the “New Vienna” of the United Nations Headquarters, the office complexes etc. The sights in Vienna are many and although below we highlight Ten for you, there are thousands and thousands of interesting sights and events to enjoy.