Thank you for clarifying. I misinterpreted the question, my apologies. Two movies that immediately come to mind:
Vampyr (1932) has a great double exposure sequence which no doubt would have been much easier to shoot with modern methods. Strongly recommended to fans of early horror movies. It features several shots that are both haunting and absolute classics.
Staying with the same director, Dreyer, The Passion of Joan of Arc would be another candidate. The camera angles in themselves are an effect and contribute to the oppressively disconcerting atmosphere. The way the set was designed with holes in the walls to allow for the camera to be placed in certain ways is genius. Modern methods would not have improved on this aspect of the film, but, on the other hand, nevermind CGI or effects, this movie features a bloodletting scene which could not happen today!
I also agree we don't need this movie remade. However, I don't think it's fair to say there are no ideas in the movie for contemporary audiences. There's a lot of subtext if you look past the religious layer! It really is a masterclass in horror