The nomadic herdsmen of the Bakhtiari ethnic group move their livestock and families to grasslands in Iran. The people and their animals must scale the highest peak of Zardeh Kuh in the Zagros mountains Iran. A group of men remove their shoes and trek barefoot in the ice and snow hacking a path for the livestock and their families to follow. They trail their way up the mountain in a zigzag fashion before finally reaching the peak. View down to the long trail of nomads. The tribe eventually reach the grasslands and settle. A document relating to the film crews account of this 48 day trek is shown at the end.
(NOTE: Known as Grass, this film was made by Merian C. Cooper, Ernest Schoedsack, and Marguerite Harrison. Here's another clip.)