A hospital is not a tree. We shall imagine it as a small town, a micro-city: a network of medical and non-medical spaces, pathways, procedures and encounters. It is a part of every-day life for patients, visitors and relatives, its employees and the people living in the neighbourhood. Representing an important piece of the urban puzzle the hospital exerts significant influence on the city¿s development. On the other hand, the hospital itself always epitomised the role of health in our cities. Along the lines of the past 250 years' historical developments the thesis explains the re-integration of the hospital into the city as well as the re-urbanisation of health. Changes in health and hospital planning bring along changes for the city as a whole. At this very moment, re-urbanisation is taking place; it grew to be a contemporary phenomenon. Against this backdrop the thesis examines the linkages between hospitals, health and the city and sheds a light on the repercussions of these relations on the single entities. Finally, the considerations lead to question the very existence of the hospital: in the future, will it still be there? If not, will the city absorb all its functions and mutate into one giant treatment area? The process of re-urbanisation surely offers a big promise for the development of future hospitals, health promotion and for the city itself. As history, we must be very careful when euphorically embracing holistic approaches to health (or to healthism). In this light, the thesis points out disadvantages and potential benefits of the urbanised hospital in a healthy city.