This chapter discusses urban developments in two major cities in Serbia, Belgrade and Novi Sad, influenced by the Balkan political crisis of the 1990s. Belgrade is the national capital of Serbia, with a dominantly Serbian population. Novi Sad is the capital of the Autonomous Province of Vojvodina, and home to a population of more than 20 different ethnicities. The seemingly bipolar relationship between these two cities started to emerge during the fall of Yugoslavia and has intensified during the subsequent shrinkage of the country into the current state of Serbia. The effects of war as well as migration have left their mark on the urban situation of both cities. Both cities are not old by European standards, Belgrade emerging before the rise of the Ottoman Empire and Novi Sad being a product of the eighteenth century and the rise of the Austro-Hungarian Empire. These two cities traditionally vary in size and ethnic make up from almost mono-ethnic Belgrade to multi-ethnic Novi Sad. This paper will explore the idea that national capitals such as Belgrade can give rise to “un-national capitals” such as Novi Sad. This will be viewed through a lens of the role of architecture and design in affecting the realities of both cities.