Italian horror master Dario Argento practically invented the giallo (Italian for "yellow") genre. Bloody, freaky and weird, giallo movies are the equivalent of American slasher films with a Euro twist. Films like Argento's seminal Suspiria, paved the way for graphic gore and violence in horror films like Dawn of the Dead and Friday the 13th.
Argento's most recent is simply called Giallo.
More of this, anon.