This map represents the distribution of secret societies, "typical" age classes, and "typical" men's houses world-wide as identified around 1900. From the early 19th century onwards, the European secret societies functioned as a model for the classification of certain associations outside Europe.
Untitled Map, 1902, unknown author, in: Heinrich Schurtz: Altersklassen und Männerbünde: eine Darstellung der Grundformen der Gesellschaft, Berlin 1902; image source: Courtesy of the International Institute of Social History, Amsterdam, http://socialhistory.org/.