Photographer Piet Niemann (b. 1991) re-visited the EXPO-site and documented the current state in a comprehensive body of work, twenty years after the world fair took place. Sustainability and the successful development of the exhibition site into a "city of the future" are often promised by politicians - similar to the Olympics. But is this actually the case? Twenty years later, it is interesting to find out what has remained and been delivered from these often full-bodied promises-or not. Piet Niemann has planned to make a photographic observation of all EXPO sites, twenty years after the world expositions have taken place. Thus, the declared goal is a documentary work that grows steadily, enables a reflective view of the past and ideally initiates reflections on responsible action in the future.