What did a city look like 2000 years ago? Answers to this question are being provided by a 3D reconstruction of Roman Cologne. The unique research project Visualization of Roman Cologne has succeeded for the first time in producing, in real time, a model of the city at a certain point in time that is fully navigable in its entirety. The digital reconstruction of ancient Cologne is the result of a joint research project of the Archaeological Institute of the University of Cologne, the Köln International School of Design (KISD) the Cologne University of Applied Sciences, the University of Potsdam’s Hasso-Plattner Institute, and the Cologne Romano-Germanic Museum (RGM). The research project was financed by RheinEnergie Foundation youth/work/family.