Books like Castle for Rent

Once upon a time, the king of a mysterious castle found himself out of place. The odd thing was that the time was the future and the place was New York City! Castle Perilous had been a universe unto itself until it started living up to its name. Now it is a gateway to thousands of universes, each increasingly bizarre and more bewildering. Behind every door there is a room for every fantasy and around each corner a perilous journey for every inhabitant. With its population sent to otherworldly realms and demented demons taking their place, will anyone find their way home in time? The stone walls may be the only stable element in this fantastic fable, as time and place disappear before one's eyes. Pandora's box has never been so big!