Prof. Ivo Maroević, PhD (1937 – 2007) was the founder of the Museology Section within the Department of Information and Communication Sciences, Faculty of Humanities and Social Sciences, University of Zagreb. Since the beginning of his teaching career, in 1983, until 2007, he created a rich collection of more than 9000 slides. Following the professor's teaching courses, the collection is divided into three sub- collections – Museology, Protection of Monuments and Urban Topics. The attachment brings descriptions of the collections as well as the results of research into the collection of older teaching slides found in the Maroević collection, the oldest of which could belong to the period of the first professor of Art History and Archaeology at the University of Zagreb – Izidor Kršnjavi. Ivo Maroević's slides are accompanied by his comprehensive and structured documentation that has helped to recognise the heritage significance of the Collection and to facilitate its processing and use. The intense involvement of students from the very beginning of the digitisation of the Collection also required the development of different approaches to participation and collaboration, including a new approach to the application of crowdsourcing in the field of education. With the public announcement and the gradual introduction of multilingualism, the Collection will become accessible and visible in international contexts, just as Ivo Maroević was for years.