I'm honestly disappointed that they haven't tried to do some crazier shit with towns in general, honestly
I think the weirdest it ever got was- correct me if I'm wrong, but- a tudor-era village with magic and shit in 3? Then maybe the obligatory Strangeville knock-offs or the one time they went to another planet.
Why not a Venice rip-off with a huge emphasis on watersports or collecting minor pets? Why not some high-up mountain village with great locales for skiiers and astronomers? Walled cities like Cringe Retard mentioned? Some luxury underground town made of bunkers like the luxury ones in Vegas? Anything with more elevation than the fucking Netherlands?
I realize the Sims is supposed to be grounded, but honestly they aren't taking advantage of the concept enough. You can only do so much with a flat city in a grassy place with maybe a river in the middle or off to the side and it gets a bit tiring to see the same stuff over and over. 3 did a decent job of changing things up with stuff like Barnacle Bay or the aforementioned Tudor village + other planet, but they're a bit too far-removed from regular life for my taste whereas something like I suggested is different enough to be interesting but realistic enough to be engaging.
Kinda hope one of the wannabe indie clones that eventually steals the spotlight does more with city differentiation, I guess.