There is a growing interest in relating agent-based models to real-world locations by combining them with geographical information systems (GIS) which can be seen with the increase of geosimulation models in recent years. This coincides with the proliferation of digital data both in the two and three dimensions allowing one to construct detailed and extensive feature-rich and highly visual 3D city models. This chapter explores some of these developments in relation to our own initial work on building 3D geospatial agent-based models of urban systems and the technologies that allow for such models to be created. These range from coupling agent-based models with 3D visualization, to building 3D agent-based models in 3D animation and rendering packages, and to using 3D virtual worlds for the creation of agent-based models. © 2011 Bentham Science Publishers.