In the last years of the nineteenth century the population of Berlin was expanding rapidly. The attendant issues of housing large numbers of people in cramped conditions were not far behind.
By 1898 the German National Insurance Institute had a sanatorium built for the victims of tuberculosis. Beelitz-Heilstätten steadily grew and functioned for many decades, playing host to a number of infamous patients, including Adolf Hitler. Yet most of it is now abandoned.