I'll give a screen shot of one of mine: The Fortress of Whitegold.
I started by digging into the mountain below, and in the large chambers beneath my city, I still maintain storage piles, underground farms, somewhat extensive sewers, and halls that lead to my crypts.
My dungeons are also located within the hill you see in the rear. Many who displeased me have starved to death while hunched over a lever there.
The four lower buildings in the first row closest to the bottom of the screen are where most of the people live. I arranged the rooms so that over 200 rooms are contained in that cluster.
The round building is an arena that has occasionally seen use, but use has tapered off ever since the latest enemies became trap-immune.
The buildings surrounding the arena are workshops or residences for legendary workers. They live near their work.
The taller building with a point is a memorial building where the captured leaders of enemy factions are held on display.
The three buildings in the fourth row are the residences of nobles. The duke/duchess and descendants of my founders inhabit these.
The palace in the background I made for fun. It is mostly filled with extraneous furniture. The original king died of old age, so I picked a random migrant peasant and made him king.
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The gimmick to this fortress is that the inhabitants only live for ten years. So I've been watching generations of families rise and fall over the years. It's a pain getting the population just close enough to fall in love quickly, but distant enough so that the tantrum spirals when someone dies aren't too disastrous.
My fortress once nearly died when spiders overran the upper levels and massacred everyone, including the current king, but some of my peasant hid in the sealed-off lower levels and waited them out.