You're looking for more obscure/unknown films of what sort? The long tracking shot types, where nothing happens?
Bela Tarr. Check out his films. Werckmeister Harmonies is my favourite. One of the best ever made. Satantango is a 7 hour masterpiece. The Turin Horse, The Man From London, Damnation... He's made quite a few stunning films. They have this aesthetic of a highly personalized, and very sedate post-apocalytic landscape--narrative. I don't know why, but it works.
Gábor Bódy's Narcissus and Psyche is another film, 4 hours or so, with that fabulous German Udo Kier playing one of the leads. Despair and isolation in a sense, and behind the narrative is lurking the history of Europe in the 19th century. Really interesting story, and beautiful cinematography.
A lot of Eastern European arthouse cinema is good for that. Lopushansky, Bartas, Tarkovsky, Tarr, Bódy, Sukorov, and so on. Some do it well, others, poorly.
With films quite a bit more cluttered, I highly recommend Wojciech Jerzy Has. The man was a genius. The Hourglass Sanatorium and Saragossa Manuscript are both amazing films, and so wonderfully bizarre.