On to the ruins. I wish I had taken notes -- the excavations look quite similar on the pictures, and now I'm confusing which picture is of which excavation. I do remember that the largest one is called Pueblo Bonito:
From another perspective:
... and yet another. Here you can see that these were fairly high structures.
I
think this one is Pueblo del Arroyo. Smaller, but looks similar.
The remotest site, Penasco Blanco, was my personal favorite. No signs keeping you on the trail. You can roam freely there, and you're absolutely alone. I didn't see a fellow hiker in three hours. Bliss!
Here's an overview of Penasco Blanco:
... another angle ...
... and this is the view the Anazazi had from their windows:
There is some important astronomical significance to the structures in Chaco Canyon, but I can't say much about it because I missed the tour. But I bought a couple of books, and will post a few lines once I've read up on the astronomy stuff.