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"If you don't care about science enough to be interested in it on its own, you shouldn't try to write hard science fiction."
- Frederik Pohl

Machine City  
  A city that is a self-maintaining whole entity.  

This is a very early reference to the idea of a city that is really one large, complex machine. It is self-maintaining; it is designed to exist forever, without any intervention by man.

The city was divided into two sections, a section of many strata where machines functioned smoothly, save for a deep humming beat that echoed through the whole city like a vast unending song of power.

Seven or even seventy million years don't mean much to old Mother Earth. She may even succeed in wearing down those marvelous machine cities...

When the builders made those cities, they forgot one thing. They didn't realize that things shouldn't go on forever.

From Twilight, by John W. Campbell.
Published by Astounding Science Fiction in 1934
Additional resources -

Readers familiar with Robert Silverberg may recall the city on Lemnos, from his novel The Man in the Maze; also, in Ray Bradbury's Martian Chronicles he refers to cities that kill invaders and clean up after themselves.

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Additional resources:
  More Ideas and Technology from Twilight
  More Ideas and Technology by John W. Campbell
  Tech news articles related to Twilight
  Tech news articles related to works by John W. Campbell

Machine City-related news articles:
  - Songdo IBD Smart City
  - UK's Self-Repairing Cities

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Real-Life Macau or Ghost In The Shell
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Seasteading Floating Cities
Aequoreas Floating Village 3D Printed From Ocean Junk

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