Assassin’s Creed is doing amazing things with historical 3D visualization. Obviously they are taking liberties with details – was there a tree right there? What did the sign hanging off this building look like? Who knows.
But there is a lot of data out there, including street layouts, trace evidence of plot and building size, and potentially deeds and tax rolls that would tell us, say, if a cheesemonger was at a particular place or not. Most interesting to me, however, is whether they got all the streets right, or if they got the main monuments, after which they used artistic license or a script to generate the rest.
Academically, getting those streets and the outdoor rooms they create right is my main interest.
