The White Buffalo(1977)

In this strange western version of Moby Dick, Wild Bill Hickok hunts a white buffalo he has seen in a dream. Hickok moves through a variety of uniquely authentic western locations - dim, filthy, makeshift taverns; freezing, slaughterhouse-like frontier towns and beautifully desolate high country - before improbably teaming up with a young Crazy Horse to pursue the creature.