The Changeling, Don't Look Now, and The Wicker Man are all among the best and most essential horror movies of the 20th century you simply must watch.

Horror movies reflect what a culture is afraid of. Professor Emma Ben-Hadj runs a class that studies the different waves of international horror, and how these movies reflect those fears.

From tales where the monster wears a human face to detectives unraveling a case entangled with supernatural forces, the best entries in this subgenre push boundaries and redefine what horror can be. They leave you shaken by what they reveal — about the killer, and sometimes about us as viewers.

Guillermo del Toro is no stranger to making unsettling and sometimes horrifying movies, including the likes of Frankenstein and The Devil's Backbone.

From 'Antichrist' to 'Deadgirl', Vanessa Maki shares some of the most disturbing horror movies released in the 2000s.

The 21st century so far has given us scary movies with an artful bent, such as "Sinners" and "Hereditary." The best horror movies since 2001, ranked.

October 23rd is National Horror Movie Day, which is the perfect day to promote the thrills of being scared by great horror films.