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Hi Eileen, One example of an ancient observatory in the United States is Chaco Canyon in New Mexico. You can learn more here: http://www.exploratorium.edu/chaco/ Another is the Bighorn Medicine Wheel in Montana. You can learn more here: http://solar-center.stanford.edu/AO/bighorn.html Unfortunately,...

There is a very famous ancient solar observatory in Chaco Canyon, made by Native Americans long ago. They have a scroll etching (the "sun dagger") and the sunlight that passes through a cleft in the rocks makes a special pattern on the scroll at the equinoxes and solstices. For a neat explanation...