[TechnicolorNightmare]

"August Underground's Penance" (2007)
"The Blair Witch Project" (1999)
"Caligula" (1979)
"Cannibal Holocaust" (1980)
"City of the Dead" (1960)
"Cube" (1997)
"Dawn of the Dead" (1978)
"The Descent" (2005)
"The Evil Dead" (1982)
"Five Across the Eyes" (2006)
"The House on the Edge of the Park" (1980)
"Inheritance" (2004)
"I tre volti della paura" (1963)
"Ju-on" (2002)
"The Lady Vanishes" (1938)
"The Last House on the Left" (1972)
"Les diaboliques" (1955)
"L'uccello dalle piume di cristallo" (1970)
"May" (2002)
"Nosferatu" (1922)
"[Rec]" (2007)
"Rohtenburg" (2006)
"Peeping Tom" (1960)
"Psycho" (1960)
"Saw" (2004)
"Session 9" (2001)
"Suspiria" (1977)
"The Texas Chain Saw Massacre" (1974)
"Welcome to the Jungle" (2007)
"Wolf Creek" (2005)

These are all the horror films I've seen that I consider masterpieces. I've highlighted the lesser-known films in case the majority of people have already seen the other ones.