The Pavilion of Christian religions of the EXPO 2000 in Hannover - realized as a steelgrid-construction filled with glass panels - was erected to represent the exhibitions motto 'human-nature-technics' and for contribution of the Catholic and Protestant Churches. From the beginning on sustainability of construction as well as the future utilization were important issues for the design. The pavilion architecture has been reduced to the presentation of the structure of the modular system with all its details; structurally simple and clear, limited to a few materials, precise in detail, characteristic in its appearance and atmosphere. The extremely modest and simple materiality: marble, coated steel, fair-fared concrete, glass. After the EXPO the pavilion was translocated to the protestant monastery of Volkenroda and new interiors were added to the chapels in the side aisles by artist Andreas Felger.