City of Doors
the archways leading into the bazaar are all portals triggered by stolen items. There are orbs outside the bazaar to detect if an item is stolen. The orbs are voluntary.
This has led to the habit of thieves abandoning stolen Items for a year and a day in inaccessible locations to break the bonds of ownership. Which has only reinforced the fervor of treasure hunters seeking these treasures.
When a person dies they give up these ties of ownership, unless they don't and that's how you get ghosts.