Subway dreams

So if one were going to write an AU set in a land of flying mermaids and subway wild hunts aka Turkey, obviously it should be in Griffinverse Istanbul. But I don't know Istanbul. Maybe Neverwhere? Mh. Maybe AU Somewhere Else Entirely?

But for research purposes I took A Madness of Angels out from the library and may peruse it desultorily this weekend. I wish someone Japanese would write a Griffinverse Tokyo so I could know what the real spells and bounds are, from an insider's pov.
( Anent which )