Frankly I was thinking too of Assassin's Creed. I've never played it but from videos I've seen it looks like they're able to give the impression of entire citie

Frankly I was thinking too of Assassin's Creed. I've never played it but from videos I've seen it looks like they're able to give the impression of entire cities recreated with a fair level of accuracy, and populated with crowds, animals and everyday objects, with realistic elements such dirt and smoke. I wonder how hard it would be to port the material used to create these videos (that might be accurate from a historical point of view but overall look way too schematic) to AC's engine- not to enjoy killing enemies in the context if the imperial Rome, but to provide a realistic environment to move through in real time. I think it would be loved by casual users and specialists alike. For example, check this reconstruction of Athens in the 5th century BCE, it beats these ancient Rome videos in every possible way: https://youtu.be/-a8cWF-29lI https://youtu.be/-a8cWF-29lI