The Palace of Nations (, ) is the home of the United Nations Office at Geneva, located in Geneva, Switzerland. It was built between 1929 and 1938 to serve as the headquarters of the League of Nations. It has served as the home of the United Nations Office at Geneva since 1946 when the Secretary-General of the United Nations signed a Headquarters Agreement with the Swiss authorities, although Switzerland did not become a member of the United Nations until 2002. In 2012 alone, the Palace of Nations hosted more than 10,000 intergovernmental meetings. History Buildings used before completion The Palais Wilson was used until 1936 as the main building of the League. Though the Assembly met in Geneva at the Salle de la Réformation (in a building at the corner of Boulevard Helvétique and Rue du Rhône) from 1920 to 1929, and at the Bâtiment électoral or Palais Électoral (Rue du Général- Dufour 24, later used by IPWA, the Red Cross affiliated International Prisoners-of-War Agency) from 1930 to 1936 as well as for special sessions at the Pavillon du désarmement adjacent to the Palais Wilson, before moving into the Assembly Hall of the Palace of Nations. Project and construction An architectural competition held in the 1920s to choose a design for the complex described the project as follows: The Palace, whose construction is the object of the competition, is intended to house all the organs of the League of Nations in Geneva. It should be designed in such a way as to allow these organs to work, to preside and to hold discussions, independently and easily in the calm atmosphere which should prevail when dealing with problems of an international dimension. A jury of nine architects was selected to choose a final design from among 377 entries: Hendrik Petrus Berlage, Victor Horta, Josef Hoffman, Charles Lemaresquier, John James Burnet, Attilio Muggia, Ivar Tengbom, Carlos Gato of Madrid, and Karl Moser. The jury was unable to choose a single winner. Ultimately, the five architects behind the leading entries were chosen to collaborate on a final design: Julien Flegenheimer of Switzerland, Camille Lefèvre and Henri-Paul Nénot of France, Carlo Broggi of Italy and József Vágó of Hungary. Donations from League members were used in the interior. Completion (1936) The Palace constituted at the time of completion (1936), volume wise, the second-largest building complex in Europe after Versailles ( vs. ). Expansion for