Photographer Piet Niemann (b. 1991) revisited the Expo site and documented its 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 photo - graphic observation of all Expo sites, twenty years after the world expositions took place. Thus, the declared goal is a documentary work that grows steadily, enables a reflective view of the past, and ideally initiates reflection on responsible action in the future.