This hackathon and many maps put #Zurich on the map. When you consider maps and, particularly historic maps, they have four corners and a date. That is the minimal approach to a map. You can add to this what a map intends to show, it can be a thematic map or a generic map.
When you add the four corners of a map as properties to a map, you can query for the maps that include Zurich.. When the maps are dated, you can show them in order..
It is really exciting that it has been decided what we need in a map on Wikidata.