The Idea to create a demonstrative reconstruction of a historic City Wall example of Hattusa was born by the german excavation team of the DAI Istanbul in an analogy representation to a small historic ceramic model that has been found in Hattusa. It was a challenge to develop historic construction technologies and define methodical principals and details of finishing, since there are no original historic examples of large mud brick walls in Hattusa remaining. The reinforcement of such walls in historic dimensions – up to 6 m thickness – was not finally investigated. A very detailed conception for mud brick structure and construction design for wooden elements was elaborated. For static reasons a massive stone pedestal, executed with original stone blocs, was built as the base for a large coffer wall system of mud bricks and for the tower ground. Parts of the implementation of the City Wall could be distinguished as “experimental Archaeology.