The city lives under a fake sky dome in a canyon. Outside is too polluted to be habitable. The giant vertical structure attaching to the cliff contains water and air filter system, generate energy, and also house thousands of civilians.
ArtStation - "Robinson the journey" - "Esmeralda" habitat module concept design, Ivan Tantsiura
Canyon City , Tu Bui on ArtStation at https://www.artstation.com/artwork/n1w51
Orbital Lift by IllOO on deviantART
Mass Effect 3 Citadel - What's not to love from modernistic worlds, to a green environment
70s sci-fi art: boomerstarkiller67: The Future - art by Shusei...
Saucer Separation – Star Trek USS Enterprise NCC-1701 D Galaxy Class Mehr
Spaceship near a City on the Moon by John Berkey. #Spaceships #Starships #JohnBerkey