james rubin, thank you very much. >> thank you. >>> final tonight, we conclude this week's series but a fascinating look at the culture of australia. the remnants of an ancient civilization is being threatened by the encroachment of the modern world. in australia as you hear this report, a history written in the land is in danger of being erased. . >> sunrise on the northwestern coast of australia. at the dawn of human history, the first people arrived here and settled the southern continent. they are thought to have come here on bamboo rafts. theirs is the oldest living culture in the world. some of the descendents settled here in an arch they carved pictures of animals and ski creatures on the rocks. for australia's indigenous peoples, it became sacred ground. >> it is the bible of the land. not only just in one place, it's all over. white people, they have a church to go to. they have everything on the book, written on the book. aboriginal people, n when they take young people out with initiations, that's when they teach people singing of all animal animals and everything that's in