Who created these huge, mysterious wheel patterns in the Mideast thousands of years ago?

Called geoglyphs, these strange circular patterns etched into the rocky sands from Saudi Arabia to Syria have no known meaning or origin. Though archaeologists say they likely date back over 2,000 years, there are no records of who made them, nor why they would make such elaborate patterns that can only be… »9/15/11 5:46pm9/15/11 5:46pm