This photograph shows the assembly hall of the League of Nations in Geneva, Switzerland. The League of Nations was established after the First World War in order to institutionalize international cooperation in mostly political, but also economic and social matters and thus prevent another world war. Germany joined the League in 1926 but declared its withdrawal only seven years later after the NSDAP rose to power in 1933 (caption by the editorial team).
Deutschlands Eintritt in den Völkerbund: Die erste Sitzung des Völkerbundes im Reformationssaal in Genf, black-and-white photograph, 1926, photographer: Georg Pahl; source: German Federal Archive image 102-09042 via Wikimedia Commons, https://commons.wikimedia.org/wiki/File:Bundesarchiv_Bild_102-09042,_Genf,_V%C3%B6lkerbund,_Sitzungssaal.jpg, CC BY-SA 3.0 DE Deed / Attribution-ShareAlike 3.0 Germany, https://creativecommons.org/licenses/by-sa/3.0/de/deed.en.