In the heart of Magdeburg, Germany is a mosaic superstructure known as the Green Citadel. Equipped with residential apartments, shops, cafes, hotels and a preschool, the complex was built to be an oasis for all mankind. Taking only two years to complete construction, the Citadel is considered one of the first pre-fabricated buildings in Germany. With its incredible pink exterior and bright green gardens, the building stands as the last work of architect Friedensreich Hundertwasser, built to be "an oasis for humanity and nature in a sea of rational houses."