United Nations peacekeeping is a unique and dynamic instrument developed by the Organization as a way to help countries torn by conflict and create the conditions for lasting peace. The first UN peacekeeping mission was established in 1948, and over the years, UN peacekeeping has evolved to meet the demands of different conflicts and a changing political landscape.
The United Nations has four major headquarters, located in New York, Geneva, Vienna and Nairobi. Its oldest and best-known office, in New York, was constructed in 1950 by a multinational team of leading architects and is now recognized as a modernist landmark. The United Nations headquarters serve not only as administrative offices for the Organization but also as homes for the diverse collection of artwork and historic objects given to the United Nations as a gift by its Member States.