Blending digital mapping and ancient history is a pretty exciting project from my perspective! Each map entry is a fascinating story, Rome is a city of both yesterday and today but this is a treasure trove of information about the city itself in the Augustan age.
https://www.digitalaugustanrome.org
and… also very cool:
3D interactive map of the Colosseum
More digital mapping: http://www.mappingrome.com/openrome/index.html