The Shadow Temple for me wasn't bad, that kind of horror doesn't have much affect on me. The Forest Temple though scares the living diarrhea out of me.
I hate the place, knowing that it used to be a mansion. Then some some creepy green haired little girl is in there. The music is downright bone-chilling. The courtyard is an actual courtyard, looking up you see castle turrets. In the boss room there are those paintings, I mean what was that room...