North of the so called Pfaffenturm (priest’s tower) there is one last part of Aachen’s outer, late-medieval city-wall. In opposite to the much earlier inner one, where still such segments can be found but no gates and towers, the outer wall-belt has today few wall-parts only, but several towers and two gates. In the frame of an adjoining new-building-construction the City of Aachen decided to refurbish the existing, rare relicts. According to this I got the order to do the necessary photogrammetry. The task was to document the visible wall-surface and the capping. Last thing was done from the roof-floor of the neighbourhood-house.