I am a huge vintage film fan, and I will try to hold myself back a little bit here:
The Cabinet of Dr. Caligari (1920). German expressionist silent film, with probably my favorite completely weird set designs. There are English-subtitled versions available, including on Youtube.
M (1931). German horror/thriller. This film launched actor Peter Lorre to international stardom. His character preys upon children, and while the plot is grim, it is a well-made film. There is a high-resolution English-dubbed version on Youtube.
Island of Lost Souls (1932). Horror. The first film version of The Island of Dr. Moreau by H.G. Wells. Paramount Pictures saw the success Universal Studios was having with its horror pictures (Frankenstein, Dracula, The Mummy), and decided to jump in. This movie is probably not as well-known as its contemporaries over at Universal Studios, but it is one of my favorites from this period. Charles Laughton is great as the archetypal mad scientist. The uncharted island scenario reminds me a little of 'The Most Dangerous Game', which came out the same year.
Murders in the Zoo (1933). Horror. Fortunately, the entire movie does not keep up with the intensity of the opening scene, which catches you by surprise and is enough alone to give you nightmares, and is an example of the kind of material that filmmakers were getting away with before the start of the actual enforcement of the Hayes Code in the following year, when Joseph Breen replaced ex-Postmaster Hayes. Zoos have fortunately changed since the 1930's, including no more folksy, rustic wooden footbridges with low guardrails for visitors to use when crossing over live crocodile mosh pits.
I Walked with a Zombie (1943). Horror/Suspense. The team of director Jacques Tourneur and producer Val Lewton made some good horror films together. The example that is usually cited as their best result is Cat People (1942), but personally, I prefer, what is for me, the creepier atmosphere in this film.
Pursued (1947). A psychological western/mystery/suspense. Robert Mitchum has strange dreams as an adult, and someone seems to be out to get him. This reminds me a little of Hitchcock's film Spellbound (1945), and seems to me the kind of western film Hitchcock would have done, if he had ever done a western. This should be on Youtube.
The Lady from Shanghai (1947). Film noir/suspense/thriller. A plan to fake a murder goes awry, with the wrong man blamed. Orson Welles wrote the screenplay, and directed it (though he is uncredited with the direction). Starring Rita Hayworth, his ex-wife. Imaginative camerawork in the finale, filmed in the 'fun house'. This is on Youtube.
Les Diaboliques (The Demons) (1955). French horror/suspense. These days, this film is usually referred to simply by the shortened title, 'Diabolique' (which is a 'true cognate' for 'diabolical'). The mistress of a teacher, and his wife, plot revenge on a philandering husband. There is a low-key French inspector who reminds me a little bit of 'Lt. Columbo'. This is another film they should not have bothered doing a remake of. There should be an English-subtitled version on Youtube.
The Night of the Hunter (1955). Horror/Suspense. Robert Mitchum's character is one of the most misogynistic you will ever encounter on film. Directed by Charles Laughton. Some very frightening scenes.
Sweet Smell of Success (1957). Film noir, but not a crime story per se. Burt Lancaster plays a loathsome and powerful Broadway gossip columnist, and Tony Curtis is the sleazy press agent who cozy's up to Lancaster in order to help his own career. People in this film who aren't corrupt get hurt badly. The character played by Lancaster is a barely fictionalized version of gossip columnist Walter Winchell. When Winchell died in 1972, he was so loathed that the only person who attended his memorial was his daughter, whom in fact he dominated and controlled just as Lancaster's character did to the character of his younger sister in the movie.
Eyes Without a Face (in French, Les Yeux sans Visage) (1960).
French Horror. Creepy, yet stylish. When a doctor causes an accident that disfigures his daughter's face, he embarks upon a series of 'experiments' to find a solution. The white mask the daughter wears was an influence on director John Carpenter, who had the "Michael Myers" character in the film "Halloween" wear one. The one surgical scene can be difficult to watch, even now, in black and white. Find an English-subtitled version.
Okay, I've probably used up far too much newsprint already. I hope that some of you enjoy some of these films on a rainy/wintry evening.