Everyone wants his Mountains Of Madness but I don't think many people have actually read that story. Absolutely nothing happens. Nothing. Just some dudes surrounded by snow, then they come across an eldritch horror briefly and run away. The only way to turn that into a decent movie is by adding a whole lot of nonsense which would detract from Lovecraft's original work in a huge way.

The story is great as words on a page. It gets into your head and makes you think on it. Putting it on film wouldn't work.