Here's a Siggraph 2008 demo of Rome Reborn model 1.1 - a virtual version of ancient Rome. The demo used the iRT ray tracer for the Cell processor and ran in real-time on IBM QS21 Cell/B.E. blades.
Rome Reborn showcases new approaches for exhibiting historical findings in museums, classrooms, and on the Internet. Approximately 7,000 buildings recapture Rome at the peak of its glory in 320 AD, at the time of Constantine the Great. The project opens new channels for education, collaboration between scholars, and communication of archaeology to the general public.