There's TONS of great suggestions here. The Shining is a masterpiece.
If I may add one, there's a Spanish film called "REC" that is one of my all-time favorite horror/thriller movies. If you remember "Quarantine," then yeah...that's a remake of REC.
Don't be biased by its "shaky camera" style, however. It did a lot of original things with homemade, first-person cinematography which is now basically a movement in modern cinema (I'm aware The Blair Witch Project was the very first, if that's what you're about to yell at me for).
I'd say if you've got some time on your hands, then definitely check it out. I guarantee you'll have some great scares

Peace,
Carbon