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.
Lara Crofts treasure dungeon.
She’s never home, she keeps all her gold in a big pile (so she won’t notice some is missing) and if the butler tries to stop me I’ll just lock him in the freezer.