Inferno

Dario Argento's follow-up to Suspiria, the second in his Three Mothers trilogy, and if anything even less interested in narrative. A woman in a strange New York apartment building discovers it was designed by an alchemist as a home for one of three ancient witches, and the film proceeds as a series of gorgeous, illogical, dread-soaked set pieces.

The underwater ballroom sequence is one of Argento's most beautiful. Mario Bava contributed uncredited effects work near the end of his life. Watch it as a nightmare and stop looking for a plot.