Eye tracking can shed more light on the features that are distinctive and salient in an environment (i.e. landmarks) and how the spatial structure of a building is analysed by an observer. In this way, more information can be collected with respect to the objects that are used by a navigator to orient himself in a building and which elements or spatial settings contribute to the complexity of a decision node of a building as a whole. The research project mainly focusses on investigating which gaze characteristics (e.g. fixation duration, sequence) can be used within this context. In addition, the role of individual characteristics such as familiarity with the building, gender and age is examined. At this stage, experiments have been conducted in university buildings S8 (Sterre, Ghent) and Plateau-Rozier (Ghent).