Peace museums play an important role in peace education by offering visitors informal and non-formal education. As sites of remembrance, peace museums are rich pedagogical spaces for experiential learning and reflection. Educating children in the spirit of peace, tolerance and harmony between nations has been central to the work of the Museum of Peace in Rivne in Ukraine. Whilst peace museums usually engage in peacebuilding and memory making in times of peace, post conflict, this article reports on the work of the Museum in Rivne in a time of war. Wartime brings difficult questions about engaging in peacebuilding in the face of military aggression and about sustaining memory-making work when violent conflict makes memories too immediate and painful. As explained in the article, the reinvigorated peacebuilding effort at the Museum in Rivne demonstrates that, in a time of war, it is even more important to promote peace, in opposition to war. Through the annual event ‘I Vote for Peace’, the Museum has sought to create a network of schools committed to global tolerance and peacekeeping, as well as offer Ukrainian children a space for talking about their experiences and their hope for a peaceful future.