We so often forget what "history" a geographical place has. This ties the history of a specific place through multiple eras very nicely. It follows the history of the individuals and families that inhabit an area from the late 1700s through the 1970s.
This story happens to takes place in Colorado. But even if you do not like the west or frontier stories, it does not matter. The story will captivate you. Every place has a history like this.
I watched it as a teenager in the 70s, taped it on VHS in the 80s and finally have it on DVD now. My wife and I watched it in under a week--all 21 hours! The acting and cinematography are good, but secondary--the story will enthrall you!