clipped from: www.popcultureaddict.com   
1. The Cabinet of Dr. Caligari (1920)  First lets start with one of the finest horror films of the silent era. "The Cabinet of Dr. Caligari" is a very stylistic, surreal German film about a carnival act ran by the mysterious Dr. Caligari.  He exhibits a somnambulist (played by a very young Conrad Veidt) who can accurately predict death. Featuring complex and unique sets that could make Salvador Dali jealous, "Dr. Caligari" is one of the eeriest films ever made.