The secretary-general of the United Nations is the chief administrative officer of the United Nations and head of the United Nations Secretariat, one of the six principal organs of the United Nations.
The Secretariat Building is a 154-metre-tall (505 ft) skyscraper and the centerpiece of the Headquarters of the United Nations.
Image: Sr. Gladwyn Jebb
Image: Trygve Lie 1938
United Nations System
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The United Nations System consists of the United Nations' six principal bodies, the Specialized Agencies and related organizations. The UN System includes subsidiary bodies such as the separately administered funds and programmes, research and training institutes, and other subsidiary entities. Some of these organizations predate the founding of the United Nations in 1945 and were inherited after the dissolution of the League of Nations.
The United Nations Office at Geneva (Switzerland) is the second biggest UN centre, after the United Nations Headquarters (New York City).
Image: UN General Assembly hall
Image: United Nations Headquarters in New York City, view from Roosevelt Island
Image: International Court of Justice HQ 2006