Boy On a Dolphin. A luminous Sophia Loren and slightly past-it Alan Ladd (with an ever marvellous Clifton Webb).
Not the worlds greatest film by any means and I hardly know anyone who has seen it but I just love it. 1950's Greece and Sophia in glorious technicolour - just wonderful. I have seen this literally hundreds of times since I was little.
Black Narcissus. Too well known to be really a cult film, but visually one of the most hypnotic films I have ever seen.