Wikipedia has a crazy amount of fairy tale info - most include a synopsis. So if nothing mappable occurs to you, take a look.

I'll note that nothing says the fairy tale HAS to predate the 19th of February, 2014. I for one would view favorably a map based on a self-written tale, IF said tale was fully detailed in the thread :-). Some people might then tend to judge the tale as well as the map, but a quick look through that massive list of fairy tales in Wikipedia will make obvious that some make NO SENSE as far as plot or characterization...