Kind of a long video but if you skip to 1:24 you will see some huge arches. Kind of neat when you think about what these men went through and how much "easier" things are today. Makes you appreciate what we do on a smaller scale.
I have seen that video on a Dvd at a friends house before, the video also had a laurel and hardy bit where the narrator points out how everything they have with them comes in some way from trees; it was a neat old video