We have been to Chaco many times. A most AMAZING place.
New things everytime we go there.
I spent a day there is summer. What a cool place. Well, interesting. Hot as hell.
Good rock art . Not just pretty pictures.
The lunar stand still site in Colorado is fun.
Ancient Pueblo Great House Yielding Unexpected Findings ( note the twin towers in Bluff, too )
http://www.eurekalert.org/pub_releases/1998-05/UoCa-APGH-190598.php
The Bluff site is thought to be one of about 150 Chacoan “outlier” sites that were connected to Chaco Canyon
http://www.colorado.edu/news/releases/2002/276.html
Roughly 150 Chaco “outliers” up to hundreds of miles distant ...
“Things started to happen in Chaco in the 9th century,” said Lekson. “At that time, small settlements outside the canyon were fighting with each other. With the rise of Chaco, that raiding and feuding ended.”
http://www.ascribe.org/cgi-bin/spew4th.pl?ascribeid=20030217.065820&time=1332PST&year=2003&public=1