[tungsten]

As the title indicates, I'm looking for film recommendations.
In specific, I'm looking for movies similar in tone to the grudge or paranormal activity, but perhaps more cerebral. The subject matter doesn't have to be a haunting, but I'm looking for films that engender a sense of foreboding and dread by using unfriendly environments. I'd like the environment itself to be a character, with a thick and tangibly hostile atmosphere. I don't want jump scares and predictable characters (no meddlesome teens for instance). I want to see characters trapped in an upsetting and toxic (figuratively or literally) environment that slowly weighs on them psychologically. Monsters, ghosts and villains are fine, but should lend to the theme rather than distract from it. I really liked how the grudge managed to disturb me simply with it's colors, lighting, camera angles and soundtrack, but repeated viewings have lessened the impact and highlighted the flaws.
Films I've seen that come close but don't satisfy:
The Amnityville Horror, Session 9, The Hole, The Sphere, Rosemary's Baby.

Does such a movie exist?