You sure?
The snowy areas are the ones that surround Fortuna Castle, and Fortuna Castle itself. Which bears a striking resemblance to the Duomo di Milano.
I meant the areas where you fight frosts for the first time, the loop where you lower the bridge to the forest, the path you traverse under the moon light to fight berial, the place where you fight Blitz for the first time.
As for the forest area, the buildings there resemble a lot some of the ones you can find in places like Livorno.
Obviously, those areas were also designed so that they bear the effects of their respective Hell Gates, that modified the landscape.
They don't resemble in a very "faithful reproduction" comparison. Are you honestly comparing a forest to a setting inside a city which you jus posted???