WARNING: this list is only recommended for true cinephiles. Those accustomed to summer blockbusters are unlikely to enjoy these, but should feel free to try. It is always healthy to expand one's horizons.

-Bicycle Thieves (1948)
-Chungking Express (1994)
-Breathless (1960)
-Tokyo Story (1953)
-Stalker (1979)
-The Seventh Seal (1957)
-La Haine (1995)
-8 1/2 (1963)
-Seven Samurai (1954)
-M (1931)
-Cleo from 5 to 7 (1962)
-Daisies (1966)
-La Jetee (1962)
-Wild at Heart (1990)
-Passion of Joan of Arc (1929)
-Repulsion (1965)
-Three Colors: Blue (1993)
-Days of Heaven (1973)
-Last Year at Marienbad (1961)
-Le Samourai (1967)
-Possession (1981)
-Un Chien Andalou (1929)
-Oasis (2002)
-Simon of the Desert (1965)
-L'Eclisse (1962)
-Rome Open City (1945)
-The Cranes are Flying (1957)
-Pierrot le Fou (1965)
-Battleship Potemkin (1925)
-Metropolis (1927)

Originally posted by Murgatroid
It is the greatest silent film ever!

I disagree.