Looking for the Foursides, Goldenrods, whatever village or town or city you remembered from video games and that can be thoroughly explored and that are considered "big"
Kinda funny but I remember how vast Minniopolis seemed in The Urbz Sims in the City for GBA and DS and I saw a map this year that looked so tiny, amazing how big it felt at the time
From a while ago I'd say GTA San Andreas, but I really want to shout out Boston from Fallout 4. It's easily the biggest city in a game that really fills out its size with interesting places and distinct neighborhoods. There's an amazing verticality to it as well in the central districts, and the mix of real historical buildings with new retro-futuristic ones is great as well.