I, too, found the dendrochronology aspect very interesting, with tie-ins around the world, and want to know more.

Lone voice, here, I'm sure, but I found most of the program a little dull, despite being half Irish and with a high interest in the subject at hand, and actually fell asleep toward the end (granted, it had been a long day and it aired here in CA at 11pm). I was also curious about all the references to circles, mounds, etc. as being religious in nature, w/o giving any real material to back up those claims. Makes me wonder what people 4K yrs from now will think of what's left of our culture, if not turned to dust by nuclear winter. I can hear them now, theorizing on the religious significance of the Eiffel Tower, Empire State Bldg, or the faces of the presidents carved on Mt. Rushmore, etc.