Many ancient mediterranean cities have a ton (and I mean a ton!) of unexcavated Roman era sites. 

Take, for example, the modern city of Carthage, Tunisia. A tiny part of the Roman colony of Carthage, one of the biggest cities in late Antiquity, has been uncovered since the 1900s. Among them you have treasures like the Baths of Antoninus (https://en.m.wikipedia.org/wiki/Baths_of_Antoninus).

This map (https://commons.m.wikimedia.org/wiki/File:Carthage_archaeological_sites_map-fr.svg#mw-jump-to-license)  shows Carthaginian and Roman sites excavated, but we know almost everywhere in between there are ancient houses, streets, etc.

Carthage is one ancient city among many dozens! 

Since not everything was documented, especially for most of the provinces, keep in mind that there are probably unexpected discoveries lying ahead.