I just finished reading a book called Wool. It is set in a "silo" - it is a huge underground structure (probably more like an arcology really). But it's mappable based on the description in the book and this is what inspired this suggestion.
My proposal is to make a map based on a novel or short story. So it could be Silo 18 from the aforementioned book, or Camorr from the Lies of Locke Lamorra or any place from any place in any short story, novella, or novel you have read.
What do you think?