I always loved the Citadel from Half Life, it's like a metallic, brutalist cathedral. Also Combine architecture in general and the way it contrasts with the Eastern European architecture of the city, slowly consuming it.
The Copied City from Nier Automata(and by extension The Tower later on) have a really cool artificial aesthetic that I wish more futuristic /sci-fi games aped. Only example I can think of that's roughly similar is the Astral Plane parts of Control.