Vienna

Vienna is the capital of Austria, and also one of the nine States of Austria. Vienna is Austria's primate city; with a population of about 1.6 million, Vienna is by far the largest city in Austria as well as its cultural, economic and political centre. Vienna lies in the south-eastern corner of Central Europe and is close to the Czech Republic, Slovakia and Hungary.
Vienna is the seat of a number of United Nations offices and various international institutions and companies, including the United Nations Industrial Development Organization, the Organization of Petroleum Exporting Countries, the International Atomic Energy Agency, the Preparatory Commission for the Comprehensive Nuclear-Test-Ban Treaty Organization and the Organization for Security and Co-operation in Europe. Furthermore, the 1980 Diplomatic Conference was held in Vienna that led to the adoption of the United Nations Convention of Contracts for the International Sale of Goods. Additionally, Vienna is the seat of the United Nations Commission on International Trade Law's secretariat.