Not just a defining work of the French New Wave but one of the great, lasting mysteries of modern art, Alain Resnais’ epochal Last Year at Marienbad (L’année dernière à Marienbad) has been puzzling appreciative viewers for decades. Written by radical master of the New Novel Alain Robbe-Grillet, this surreal fever dream, or nightmare, gorgeously fuses the past with the present in telling its ambiguous tale of a man and a woman (Giorgio Albertazzi and Delphine Seyrig) who may or may not have met a year ago, perhaps at the very same cathedral-like, mirror-filled château they now find themselves wandering. Unforgettable in both its confounding details (gilded ceilings, diabolical parlor games, a loaded gun) and haunting scope, Resnais’ investigation into the nature of memory is disturbing, romantic, and maybe even a ghost story.