This document provides a timeline and overview of notable psychological horror films from the 1920s to the 2000s. It highlights some of the earliest films in the genre like "The Cabinet of Dr. Caligari" from the 1920s and how films from each subsequent decade, such as "Psycho" in the 1960s and "The Silence of the Lambs" in the 1990s, helped advance the genre through their exploration of the human psyche and innovative approaches to suspense and horror.