Identity on the Line (I-ON) is a large-scale cooperation project between six cultural history museums and one university, working together to explore the long-term consequences of different migration processes, forced or voluntary, which took place in Europe over the last 100 years. The project is a broad cooperation between museums in Norway, Sweden, Denmark, Poland, Lithuania, Slovenia and Croatia. Starting with similar approaches and using the same methods, each museum will work on one important migration process in its country by collecting and facilitating sensitive narratives in local exhibitions and uncovering challenges which have not been addressed before. The main findings and common features will be summarized and made available as a joint travel exhibition within Europe and a digital package for education.