Pre 1970?
Frankenstein 1931
Oh, a true CLASSIC!
That whole series of Universal Horror films from back then was just fantastic.
George A. Romero's Night of the Living Dead is way up there on the list, for me. Critics panned it back in '68 for it's unusually graphic nature (at the time).
Definitley up there on my list too XDCX. A true cult classic.
There is anothe Cult Classic that Signor Vitelli and I share a passion for titled
"The Last Man On Earth" with Vincent Price. It was later re-made with Charlton Heston as
"The Omega Man" and while I liked the remake and thought that it was pretty good, the original with Vincent Price is still my favorite version.
I believe that they've just wrapped up filming a third version, with Will Smith reprising the role that Vincent Price and Charlton Heston played, based on the original book called
I AM LEGEND.