Custom worlds where the builds stood out to you as particularly detailed or well-thought out? My current favorite in terms of architecture is Point Ouerbacker, they nailed the old americana vibe and all the buildings are thematically cohesive but not same-y. I'm a little on the fence about moving my full-time gameplay there though because the world is HUUUUUUUUUUUUGE....! But I doubt I'm gonna find a world with the same vibe any time soon.
Why don't you just save down the buildings you like? And then modify another playable world to the same style. Someone recently ran into similar issue with the Tokyo world, it is simply too big, too detailed to really play. But you can save down the lots you like, also with Miyamuchi, and put it in a more playable world.
Sanity is overrated.
Nitromon is a type of Pokemon encountered in the Pokemon Nitrome Version series.