Good Horror Films.

[sahgwa]

These are all good, if not great horror films; I guarantee:
 Possession

• 1981
  
• R
  
• 2h 4m
  
• https://www.imdb.com/title/tt0082933/
  

A Tale of Two SistersOriginal title: Janghwa, Hongryeon

• 2003
  
• R
  
• 1h 54m
  
• https://www.imdb.com/title/tt0365376/
  

 A Dark Song

• 2016
  
• Unrated
  
• 1h 40m
  
• https://www.imdb.com/title/tt4805316/
  

 Don't Look Now

• 1973
  
• R
  
• 1h 50m
  
• https://www.imdb.com/title/tt0069995/
  

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I'm surprised nobody has mentioned these three:

[Video: https://www.youtube.com/watch?v=4d5_lrn9v-g]

[Video: https://www.youtube.com/watch?v=S-1QgOMQ-ls]

[Video: https://www.youtube.com/watch?v=MBZ-POVsrlI]

The trailers for Saw and Hostel really don't do the movies justice. Both are absolutely gut wrenching. All three have sequels.

Hostel was good.

Along the lines of that slasher/weird people vibe, i think Vacancy was really good too.
 Vacancy

• 2007
  
• R
  
• 1h 25m
  
• https://www.imdb.com/title/tt0452702/
  

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I will second the recco for Let the Right One In, just bought that one. Also have to second the recco (of course) for Alien, and I thought of another one that is really good:
 Under the Skin

• 2013
  
• R
  
• 1h 48m
  
• https://www.imdb.com/title/tt1441395/