De Ceuvel is my personal favorite in Amsterdam. Its an oasis in the industrial area in the Nord Amsterdam. The goal is to provide an example for closing nutrient cycles, clean the soil in a natural way, and experiment with new technologies. All while serving as a creative office terrain.
De Ceuvel is a mecca for sustainable technology, or they named themselves a Cleantech Playground. Indeed, they are playing with waste. Many creative ways to re-use waste material present here. From composting toilet, biogas boat, upcycling, aquaponics greenhouse.