Looking for a book with gothic and ancient themes.

Hi, I’m looking for a book with themes including but not limited to:
Gothic settings like castles and dungeons.
Knights and a sense of isolation.
Makes you feel something.
Spells and sorcery.
Horror or mysterious themes.

I just have this image in my head of a desolate castle on a cold mountain and I guess I’m looking for a book that somewhat captures that idea.

Thanks!

by StinkyDingus63