Rules: only places that don’t exist, so no “NY from Spider-Man” also if you can limit to a building or little town, not an entire city or map.
My pick: The Spencer Mansion from 1996 Resident evil. I always loved that place. Of course without the creatures.
My ACNH island. I am told I am sorely missed when I go away, which instantly makes it a more desirable location than anywhere else I know of.