<-- You can tell if a location is a City by the city icon on your World Map (key "M").
Cities, unlike Outposts or Mission Locations usually provide the full set of infrastructure:
- Henchmen
- Xunlai Agent (Storage)
- Merchant
- an Arena
- various Traders and Crafters:
- Guild Registrar
- Skill trainer
- Collector(s)
Some cities have road signs marking sections of the city where NPCs offering similar services gather together.
For a list of cities, see City Locations