This awesome 200-hectare public park in Duisburg Nord, Germany was transformed from a coal-fired steel production plant into a giant industrial playground. Latz + Partner’s design emphasized the value of memory: the goal was to create a space former mill workers could explore with their grandchildren and still be able to identify the form and function of the old machinery. Concrete bunkers have been transformed into gardens; a former blast furnace into an observation tower. A derelict gas tank is now the biggest artificial diving center in Europe. Rock climbers hang from concrete walls. Landshaftspark is playful and, at the same time, encourages serious exploration of the industrial past. A lot of the pollutant clean-up was achieved through phytoremediation.