I think maybe it could be a place of significance or memory of someone youre connected to (dead or living) or WILL be connected to. Or maybe it's someplace you will visit in the future. In my case I happened to dream about the city my father's family lives....I've never been there. Maybe what i saw is somewhere one of my (deceased) grandparents lived or someplace my father or his family sees frequently. Maybe I'll know the significance (if any) one day.