The Collection of Photographs of the Croatian School Museum documents the establishment and activities of the most significant teachers' associations in Croatia. Some of the oldest photographs included in the collection are related to the establishment, i.e. opening of the Museum in 1901. In addition to the preserved photographs, the collection also presents traces of the past of the Museum through related literature, i.e. the Museum's first inventory records. Keeping pace with other European countries, Croatia followed the achievements in the field of photography and development of photographic techniques in the 19th century. That was the time when the first traveling photographers appeared and permanent photographic ateliers were established in Zagreb and other Croatian towns, such as Karlovac, Petrinja, Varaždin, etc. (Pommer, Standl, Varga, etc.). The most important events and most significant people from different walks of social life were photographed for documentary purposes. This is how the first photographs related to education and the first teachers' associations were created, collected and stored. The Croatian School Museum thus stores photographs presenting the members of one of the first Croatian teachers' associations, Teacher's Cooperative (Učiteljska zadruga), established in 1865, and the founders of the Croatian Pedagogical Literary Society (Hrvatski pedagoško-književni zbor) established in 1871, who also established the Croatian School Museum. Furthermore, the photographs serve as documentary evidence about the establishment of teacher associations across Croatia, as well as various teacher assemblies and training programs organized in the country and abroad in connection with teacher associations. It is mainly through their activities within their associations that teachers, especially in the 19th century, promoted the advanced pedagogical ideas and influenced the development of education and pedagogy.