The city sites that have no Barbarians or Tribes on them but already have many connected "Urban" Tiles - what do they actually represent?
- Abandoned settlements?
- Simply suitable locations and the urban tiles in the map are not really urban areas until someone actually settles there?
- Peaceful tribes that welcome your Settlers and willingly join your empire? Wouldn't the Settler be more of a "Diplomat" of sorts if that's the case?