The World That Never Was: The world of Organization XIII, it is home to a seemingly endless horde of Heartless and Nobodies. The Heartless seem to spawn more here due to how close The World That Never Was is to the darkness of Kingdom Hearts. The Organization controls the world from a massive fortress that floats weightlessly over the expansive Dark City. Unlike the Heartless counterpart End of the World, the World That Never Was is more man-made in appearance to reflect the Nobodies' ability to think and plan rather than act on instinct like the Heartless.

Twilight Town: Despite its subtle atmosphere, Twilight Town is one of the largest worlds known. It is located in between light and darkness, similar to the Land of Departure, Castle Oblivion, Traverse Town and The World That Never Was. As its name implies, this world's sun is always in the same position in the sky, never rising nor setting.Twilight Town is a quiet city in endless sunset. Much like Traverse Town...it is divided into several distinct districts, commonly known as Market Street, Sunset Terrace, and Yen Sid's Tower. Though the Tower is not truly part of the town; it is merely reached by a train from this world.

--  (quotes from kingdom hearts wiki)