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There's a place in Warhammer4000 which I am wondering if it would make a good "Plane of existance" example. Commorragh is a city that's within the Webway, a mass of tunnels that allow quick transport across the galaxy, it's referred to as a city but it's situated in a place of Alien Geometries and the structures are as much spaceship as skyscraper.
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How well does it match the trope?