The national history museum is simultaneously a university, library, theatre and monument. It is also an armoury. This chapter examines historical exhibitions in Bosnia-Herzegovina and Croatia and considers how in a post-conflict era these museums protect the borders of history (and thus territory). It also draws into these discussions post-traumatic museum practice in Albania. These museums attempt to present incontestable evidence in their ongoing fight against misinformation and foreign nationalism. Museum objects of all kinds become bricks in the walls of the nation. This chapter considers the evidential nature of the museum object and the influence of the curatorial author. It ends by considering the various ways competition has laid the ground for border crossing activity and for sensing common values and purposes.