Chaco Canyon is one of the great celestial and ceremonial sites in North America. The whole complex is oritented towards the sun and its movement through the year. The closer you look, the more amazing it becomes.
Puebloan culture there was most successful around 1,000 to 1,300 AD. The site has been extensively documented by using tree ring analysis from the vigas (timbers) used to construct the roof of the dwellings. Ponderosa pine logs were harvested up to 50 or 70 miles away and brought to the site. Chaco is right up there with Mesa Verde and Canyon de Chelley asone of the most important arch sites in North America.