This book is devoted to the former Viennese synagogues that were destroyed and thus disappeared irretrievably from the face of the city. With the help of CAD (computer-aided design) and rapid prototyping a working group based around the two authors was able to virtually rebuild the destroyed synagogues. In this guide historical photographs and plans from the time these synagogues were built are contrasted with the virtual reconstructions. Together with the accompanying texts they provide a complete image of the individual houses of prayer. Of particular interest are the recreations of the urban fabric that place the destroyed synagogues in the context of the present-day city.