Public space has been widely discussed by various disciplines. This chapter examines the spatial condition of parks as public spaces in relation to social ideas. It looks at the relation between political intention and designed landscape, using as an example the post-war modernist Donaupark, a public Viennese park with a strong socialist impetus and the maxim of ‘social green’. How was this idea put into practice and how has its effect evolved until today? In order to examine this relation for Donaupark, the contemporary political intentions are compared with the outcome: the study analyses programmatic documents of the time, the park’s design, its development and its contemporary uses in order to check their conformance.