How about these for a start (not a definitive list - Just off the top of my head)? I daresay you've seen several of these, but I reckon some will have passed you by.
Metropolis
The General
The Passion of Joan of Arc
Ninotchka
All Quiet on the Western Front
It Happened One Night
The Gold Rush
Bringing Up Baby
Citizen Kane
Gone with the Wind
The Wizard of Oz
Snow White and the Seven Dwarfs
The Adventures of Robin Hood
Top Hat
La Regle Du Jeu
La Grande Illusion
Double Indemnity
The Maltese Falcon
The Treasure of the Sierra Madre
Great Expectations
Brief Encounter
The Life and Death of Colonel Blimp
The Lady Eve
Laura
White Heat
Battleship Potemkin
Black Narcissus
A Matter of Life and Death
Whisky Galore
The Best Years of Our Lives
His Girl Friday
Bicycle Thieves
The Big Sleep
Arsenic and Old Lace
It's a Wonderful Life
Kind Hearts and Coronets
The Bank Dick
Bambi
Duck Soup
Les Enfants Du Paradis
The Thief of Bagdad
To Be Or Not To Be
Frankenstein
Nosferatu
The Cabinet of Dr Caligari
The Grapes of Wrath
I Know Where I'm Going
The Lady Vanishes
The 39 Steps
Notorious
Rebecca
My Darling Clementine
Stagecoach
Napoleon
Oh, Mr Porter!
Pygmalion
Red River
The Red Shoes