The thesis addresses the virtual reconstruction of the synagogue "Ezra Izrael" in Lódz (Poland) using computer-based drawing and visualization programs. The main focus of this work is to create a computer generated 3D-model of this synagogue that is as authentic and detailed as possible. Because "Ezra Izrael" was destroyed during the Second World War, these models will now persist in the form of a virtual model, for posterity. The first section of this work discusses the emergence and development of the Jewish economy during the 18./19. century. This will lead further to the economically successful Polish-Jewish businessmen named Izrael Poznanski, the architects, construction and tradesman involved in the construction of the Ezras Izrael Synagogue and their close cooperation in previous projects will be considered in more detail. Next, the historical and architectural aspects of this synagogue is described. The third section explores its reconstruction work, beginning with the research to continue the discussion with the source materials that consist of plans and photographs, their chosen solutions in case of doubt or in the absence of traditions, up to the explanation of the project documentation along with their design and the construction methods. Following, the computer processing and visualization of the synagogue represented by virtual diagrams is discussed. The index includes all planning documents and photographs used for the reconstruction.