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Horror
Ghosts, Goblins, Monsters and things that go bump in the night.  There are many classic monsters out there, and, like pinhead, a few other dimensional demons.  There is some blurring with science fiction here, and much more blurring with fantasy.  But many have a supernatural blending with real world elements that make them stand out as different.  I have not included slasher flicks or the gross fest serial killers unless they were something classic, the example being Halloween.
Best Horror Movies.Com:  A site about many of the best Horror Movies, including Hammer Horror, Zombies, and others.
Frankenstein:  1910.  First movie of the classic tale, filmed in Edison Kinetogram.
Dr. Jekyll and Mr. Hyde:  1912.  First rendition of the classic tale of a scientist who releases his darker half.
Dr. Jekyll and Mr. Hyde:  1920.  They were already doing remakes back then, obviously.
Dr. Jekell and Mr. Hyde:  1920.  Another one in the same year.  What was going on here?
Nosferatu:  1921.  The first of the Vampire Movies, with scenes that are still famous to this day.
The Monster:  1925.  Horror Comedy with Lon Chaney.  First Old Dark House Movie.
The Phantom of the Opera:  1925.  First rendition of this movie, with Lon Chaney.
The Bat:  1926.  A Masked Killer called The Bat kills people one at a time in an old house.
The Gorilla:  1927.  A man in a Gorilla suit commits murders.  So I guess he was supposed to look fake.
The Unknown:  1927.  Lon Chaney is a circus freak on the run who is not as he appears.
The Fall of the House of Usher:  1928.  Short silent movie version of the Edgar Allan Poe story.
Dr. Jekyll and Mr. Hyde:  1931.  Had to be the most made early horror movie.
Dracula:  1931.  Bela Lugosi in his most famous role, as the Transylvannian Count.
Frankenstein:  1931.  Boris Karloff in his most famous role as the monster.
The Mask of Fu Manchu:  1932.  Boris Karloff.  First of the movies about the Chinese super villain.
The Mummy:  1932.  Boris Karloff as the revived Egyptian priest who is not a mummy for most of the movie.
Murders in the Rue Morgue:  1932.  Bela Lugosi.  Adaptation of Edgar Allan Poe's story.
White Zombie:  1932.  A white visitor is turned into a Zombie in Haiti.  Bela Lugosi.
The Ghoul:  1933.  Boris Karloff in a story about a master criminal known as The Ghoul.
The Invisible Man:  1933.  Claude Rains.  Based on the story by H G Wells about a serum that turns a man invisible and mad.
Island of Lost Souls:  1933.  Bela Lugosi.  First adaptation of H G Wells' Island of Dr. Moreau.
The Black Cat:  1934.  Karloss and Lugosi.  Satanic rituals in an old Hungarian Castle.
Bride of Frankenstein:  1935.  Sequel to Frankenstein, in which the monster demands a mate.
Mark of the Vampire:  1935.  Bela Lugosi.  Vampire Count Mora and his daughter Luna stalk Prague.
Werewolf of London:  1935.  Henry Hull in this original werewolf film.
Dracula's Daughter:  1936.  Wow, one without Bela Lugosi, a sequel to Dracula.
The Invisible Man Returns:  1940.  Sequel to the Invisible Man, with Vincent Price.
The Mummy's Hand:  1940.  Not a sequel to the 1932 movie, with another storyline.
Dr. Jekyll and Mr. Hyde:  1941.  Had to be the most remade of all early movies.  Spencer Tracy.  Yeah, him.
King of the Zombies:  1941.  Back when they weren't the flesh eating monsters we know and love.
Man Made Monster:  1941.  Lon Chaney Jr. As a man who is immune to electricity.
The Wolf Man:  1941.  Lon Chaney Jr. in his most famous role as Larry Talbot, who is bitten by a Werewolf.
Cat People:  1942.  A woman finds out she is decended from people who can take the forms of cats.
The Ghost of Frankenstein:  1942.  Lon Chaney as the monster in the fourth of the series from Universal.
Son of  Dracula:  1943.  First man to bat transformation on screen.  Lon Chaney Jr. as Dracula.
Frankenstein Meets the Wolf Man:  1943.  Lon Chaney Jr. versus Bela Lugosi as the Monster.
House of Frankenstein:  1944.  Frankenstein, the Wolfman and Dracula, oh my.  Boris Karloff as none of the above.
The Mummy's Ghost:  Lon chaney as the Mummy, in Massachusetts?
The Mummy's Curse:  1944.  Sequel to the Mummy's Ghost, with Lon Chaney Jr. rising from the swamp.
The Return of the Vampire: Bela Lugosi.  A Vampire terrorizes London during both World Wars.  With a Werewolf servant. 
House of Dracula:  1945.  Sequel to House of Frankenstein.  John Carradine as Dracula.
The Picture of Dorian Gray:  1945.  A man puts all of his sins and deterioration into a painting, until it comes back.
Abbott and Costello Meet Frankenstein:  1948.  More comedy than horror.
The Thing From Another World:  1951.  James Arness as the Thing in a not faithful adaptation of Who Goes There.
The Beast from 20,000 Fathoms:  1953.  Giant beast rises after a nuclear explosion, which was to become a very familiar theme.  First of the true giant monster movies after King Kong.
House of Wax:  1953.  Vincent Price  in a 3D Color Feature about the Mystery of the Wax Museum.
Creature from the Black Lagoon:  1954.  Amphibious creature is found in the Amazon.  First of a series of movies.  Others included The Return of the Creature and The Creature Walks Among Us.
Godzilla:  1954.  First of the movies featuring the big guy taking out Tokyo.  Most famous of them all.
Them:  1954.  Giant Ants attack in the desert after an atomic bomb blast.  Another of the Atomic Monster movies.
It Came From Beneath the Sea:  1955.  Giant Octopus terrorizes the Pacific and San Francisco.
It Conquered the World:  1956.  Roger Corman beauty about a Venusian taking over the minds of Earthlings.
The Mole People:  1956.  An ancient underground civilization is found.
X the Unknown:  1956.  A radiative blob from the Earth's crust terrorizes Scotland.
Attack of the Crab Monsters: 1957.  Giant Crabs on a Pacific Island eat people, and then use their memories. Corman
The Black Scorpion:  1957.  Giant scorpions are released in Mexico following an earthquake.
The Curse of Frankenstein:  1957.  Peter Cushing and Christopher Lee in Hammer's Horrors.
The Deadly Mantis:  1957.  Another bug movie, but this one was rocket proof and took down aircraft.
I Was a Teenage Frankenstein: 1957.  American International Pictures.  The title says it all.
I Was a Teenage Werewolf:  1957.  Michael Landon in the staring role.  A hypnotist unleashes the Werewolf.
The Monolith Monsters:  1957.  Giant rocks grow in the rain and threaten to crush a town.
The Monster That Challenged the World:  1957.  Giant Snails come out of the Salton Sea.
Night of the Demon:  1957.  Satanists in Britain call up demons to sacrifice their victims.  Very cool movie.
The Blob:  1958.  Protoplasmic monster from space stalks Steve McQueen.
Dracula:  1958.  Christopher Lee in his most famous role.  Hammers Horrors.
Revenge of Frankenstein:  1958.  Hammers Horrors, with Peter Cushing as Dr. Frankenstein.
The Screaming Skull:  1958.  Ghost movies that really scared the hell out of me as a child.  Ghost Skull.
The Thing That Couldn't Die:  1958.  The head of a man executed for sorcery 400 years ago returns.
Attack of the Giant Leeches:  1959.  Kind of Lame movie about monster leeches in Florida.  Roger Corman.
The Giant Gila Monster:  1959.  Low budget giant lizard terrorizes the desert.
The House on Haunted Hill:  1959.  Vincent Price classic about people paid to spend the night in a haunted house.
The Mummy:  1959.  Hammer version with Christopher Lee.
The Tingler:  1959.  Vincent Price in a movie about a creature that lives in us and kills us when we're terrified.
13 Ghosts:  1960.   A family moves into a house with 12 ghosts.  Who will become number 13?
Brides of Dracula:  1960.  Christopher Lee is back as the Count in this Hammer classic.
The Little Shop of Horrors:  1960.  Roger Corman original about the carniverous plant.  Feed me Seymour.
Village of the Damned:  1960.  Every woman in a village become pregnant, and the children are horrible.
The Curse of the Werewolf:  1961.  Hammer film.  Don't be born on Christmas day or you will be cursed.
Konga:  1961.  Really bad movie about an ape grown to enormous size by the extracts of carniverous plants.
The Pit and the Pendulum: 1961.  Vincent Price in the Roger Corman adaptation of Edgar Allen Poe.
The Brain That Wouldn't Die:  1962.  A scientist save his fiance's head and tries to attach it to another body.
The Phantom of the Opera: 1962.  Hammer film of the classic novel, this time set in London.
Tales of Terror: 1962.  Three Edgar Allen Poe stories in one film.  With Vincent Price.
Black Sabath:  1963.  Italian/English film with Boris Karloff.  Several tales in one movie.
The Birds:  1963.  Alfred Hitchcock classic about the wild avians turning on mankind.
The Raven:  1963.  Roger Corman film with Vincent Price, and another of the supposed Edgar Allen Poe adaptations.
The Terror:  1963.  Roger Corman.  Jack Nicholson caught in the clutches of a witch.