Abstract. We explain our approach for verifying the accuracy of 3D CG manual modeling of the Citadel of Bam, which is an architectural heritage site destroyed by an earthquake in 2003. We attempted to control both the architectural quality of the 3D models with different methods and the technical 3D CG aspects since the 3D models of the Citadel of Bam need to be presented in a realistic virtual reality environment and also for research of buildings and spaces. Accuracy verification of 3D models was conducted through instructions and evaluation reports prepared by experts for modeling teams and different discussions between experts and 3D modelers.