Maybe:

1. The Wizard of Oz (1939)
2. Metropolis (1927)
3. Bonnie and Clyde (1967)
4. Un Chien Andalou (1929) - Short film, but still essential
5. The Night of the Hunter (1955)
6. Nosferatu: A Symphony of Horror (1922)
7. A.I. Artificial Intelligence (2001)
8. King Kong (1933)
9. White Heat (1949)
10. M (1931)