This chapter analyzes the computational methods used for recreating virtual worlds from the past. Terms, like photogrammetry, rendering and digital elevation models, are introduced and explained. The collaboration between archaeologists and computer graphics designers has to offer a lot to the wide spreading of cultural heritage by using innovative and appealing 3D technologies. In Section 1, several possible applications of virtual reconstructions in archaeology are discussed. Section 2 presents the methods and techniques for recreating a virtual world, while Section 3 mentions some examples and related work on the field from literature.