I recently found this picture on the Syracuse subreddit (https://www.reddit.com/r/Syracuse/comments/7v6wem/syracuse_subway_map_if_every_subway_restaurant):
(https://i.redd.it/7wk0fjfbe7e01.png)
It's a subway style map of Subway locations in Syracuse. It turns out that there's a whole subreddit of these maps called subwaysubway (https://www.reddit.com/r/subwaysubway).
Clever idea. Too bad Subway is garbage.
There's a similar map for Boston which actually left out many Subway locations accessible by subway. Then again, it's reddit, so what can you expect.