A good number of notable 'Atmospheric Horror' films already mentioned. But this thread would be incomplete if we don't mention...
Horror Films of Italian Maestro MARIO BAVA (i.e.
Black Sunday, Black Sabbath, Planet of the Vampires, The Whip & the Body, The Girl who knew too much, &
Kill, Baby...Kill!!! are mostly notable as major influential films)
and also here are few that I'd also like to mention...
House of Usher (1960)
The House that Screamed (1969)
The Woman in Black (1989 TV Movie)
BBC's annual TV film series
A Ghost Story for Christmas (1971-1978) mostly based on M.R. James stories.