Every inhabited technogically advanced planet in the galaxy...

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G'Kar: Every inhabited technogically advanced planet in the galaxy has a city that looks just like this.  Every one.  Including Narn, Mimbar, Earth, Vulcan, Romulus, Coruscant, Alderaan, etc....I suspect it's one of those great universal mysteries which will either never be explained, or which would drive you mad if you ever learned the truth