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[Dave emailed me and informed me that he didn't sleep with Gracie Slick either, and I was forced to change my tag line.]
I saw Dave's great pictures at another very good place called Grrlscientist. I visited the Chaco Canyon back in the 80's. It is most well known for Pueblo Bonito, and more recently for Fajada Butte and it's Sun Dagger Calender
But the back wall at Chetro Ketl is one scene that I have always remembered. When it was done, it was 4 stories in some places, and longer than a football field. Some of the rows of stone work, have pieces of rock as big as your index finger. As you walk along the wall you are just over whelmed by the care that was used to build this wall. Each stone was ground down, so that the exposed side is flat.
Chaco isn't easy to get to, and that's good, it keeps the riff/raff away. If you ever get the chance to visit, make a note of the educational level of the other people you meet there. No Glenn Becks is this crowd.
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That's the thing I really love about the web, going places we've never been, and returning to places we've missed.