Comic book stories are usually set on Earth or fictional planets in the universe which have been inspired either by other planets and celestial bodies in outer space or an admixture of said planets and one's imagination.
In order to explore the many aspects and places within these fictional worlds, the site Comic Book Cartography compiles several maps and diagrams from the worlds which have been created in comic books. It includes such places as the Batcave, the World of Kamandi, and Titan where Captain Marvel originated.
-via Book of Joe
(Image credit: Jack Kirby; source)