10 Most Challenging Thrillers of the 20th Century, Ranked

In terms of challenging and avant-garde approaches to storytelling in the medium of filmmaking, the thriller genre has proven to be one of the most effective avenues for non-traditional and experimental filmmaking styles. Ranging from films that focus on an array of deeply disturbing and painful subject matter to those whose very execution is tied to non-traditional storytelling methods, there are many different ways a thriller can be considered challenging.