In a design process, the question of how to respond to histories and memories associated to the existing site arises. Sites are able to communicate cultural, as well as historical aspects. Further, sites have individual value to users. This master thesis explores the different design opportunities of a site and its (pre-) history in current landscape architecture. The approach towards this topic is a thorough review of the theoretical positions found in literature and investigation of an existing, concrete built example. This thesis focuses rather on unprotected, public open spaces. Theoretical positions in literature exploring the conditions and histories of site are reviewed and structured. The positions are composed of current landscape architectural approaches. Further, the Viennese Donaupark is used as an example to explore the developed positions. In 2008, a design competition was held for the redevelopment of the park. The submitted entries are analysed with help of graphic plan analyses. The aim is to investigate the impact of the site's history and development on the various redesign submissions and the strategies used to deal with them. Interviews of planning consultants are conducted to gain insight into the planning considerations. The results of the plan analyses and interviews are evaluated using a qualitative content analysis. Finally, the results are compared with each other. The theoretical positions can partly be found, though expressed and implemented differently, in the competition entries. The diverse design interventions range from spatial-structural actions, programmatic interventions, process oriented designs, to a removing and revealing new layers approach. Conclusions cannot be made in the general handling of the historic component in its redesign process. Each site demands project and site specific considerations.