This is an excellent example of experimental archaeology, especially in the attempts of the researchers to figure out both how the Incas moved several ton blocks, but also how they shaped them into interlocking walls for their architecture. The archaeologist on hand attempts to use hammer and pressure flaking techniques. The sweeping views of the mountains are beautiful. Later, people native to the area work to create a traditional rope bridge made of dried grass. Fascinating! This was required viewing for an archaeology class, but I brought it home and my 8 year old daughter watched it with me. We both couldn't get enough! It's a shame they didn't have time to talk more about the counting and record-keeping systems used by the Incas, but it did at least answer the question of how they did so without having a writing system.