The forest atmospheres of the Hobbit and the lord of the rings BOOK are a great example here. Movies, a no no. As much as I loved the movies, they didn't capture the feel of that dark forest with trolls in them, like you don't know WHAT you'll stumble across. And for a hobbit, running into a troll (much less the group) was one of the most exhilarating things, period. Now, for Geralt, a bad arse, I don't know how you'd port the same feel over, but at least those forests themselves are a great example.