The Great Witch of Theatergoing, Drama, and Spectating's Noble City of Carefully Selected Books, also referred to as the City of Books (図書の都,Tosho no Miyako) or the Library, is a sacred realm under the supervision of the Witch Senate.
The City of Books appears as a giant library, with massive shelves holding countless books picked by Featherine Augustus Aurora herself. As stated by Bernkastel, each book contains a different world, similar to Beatrice's game board. The city itself is protected by a holy barrier. Only a witch of the Senate may enter, and outsiders may only enter if they are invited.