Ten top alternate Londons in fantasy

At the B&N Sci-Fi & Fantasy Blog Jeff Somers tagged ten favorite alternate Londons in fantasy. One title on the list:
The Invisible Library, by Genevieve Cogman

The London visited by Library Spy Irene in the first book of Cogman’s popular series is definitely “alternate,” in the sense that it’s fairly squirming with vampires, faeries, and werewolves. The mysterious book the magical librarians