The third-largest largest mosque in the world is currently being built on the bay of Algiers. It has about 95,000 square meters of natural stone facade, boasts the highest minaret in the world, a dome of 50 meters diameter, and a Prayer Hall in which 35,000 worshippers can gather. The complex - which is expected to attract 120,000 visitors a day - is impressive in many respects. The project represents a unique challenge for the facade planners from DS-Plan. They are supporting a consortium comprising Jürgen Engel Architekten and the engineering firm Ingenieurbüro Krebs und Kiefer with the planning of the facade. In addition to the technical implementation, the historical, religious and esthetic aspects of the task make it a special challenge. For example, it was necessary to develop solutions that would allow traditional filigree Islamic ornamentation to be incorporated without delaying the project.