During the last twenty years, technical development in the field of CAD programs has contributed to the creation of a new research approach. 3D reconstructions and virtual reality programs have become very popular for archaeological sites and for partially destroyed historical monuments. The attractive visual effects of these programs have increased the popularity of these reconstructions. Early attempts in this field emphasized the advantages of such programs compared to reconstructions built in stone or brick. More recently, the advantages of 3D reconstructions compared to physical reconstructions have not been in the forefront of discussions related to 3D or virtual reality programs Visual effects and technical developments became more attractive aspects then theoretical issues for the creators of such programs. However, if archaeology wants to use the flexible character of these reconstructions, the most important theoretical issue, the question of authenticity, should be addressed. The workshop and the related presentation of 3D reconstructions and virtual reality programs will focus on the problem of the visualization and the demonstration of different reconstruction attempts and their relationship to relevant archaeological data.