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In 2016 filmmaker/photographer Pete McBride and writer Kevin Fedarko set out on a 750-mile journey on foot through the entire length of the Grand Canyon. More people have stood on the moon than have accomplished this task. Their quest was more than just an endurance test — it was also a way to draw attention to the unprecedented threats facing one of our most revered landscapes...。Mark从小生活在小村庄，那里有很多的白色水牛，村长希望Mark可以用功读书，上完大学，每年都将白色水牛卖了给Mark交学费。Mark也在很用心的学习，可是英语考试一直是他头疼的科目，他为了这个科目又多上了两年的大学，最后还是失败，Mark决定不再学习，开始了自己人生的旅程，而白色水牛也成了他接下来生活的一部分。。