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A red granite obelisk towering above a ramshackle, squalid suburb of northeast Cairo, is the last visible vestige of a nearly 7,000-year-old city where ancient Egyptians believed life began. Archeologists say they soon expect to unearth other artifacts and unlock the secrets of the sun-cult city of On buried beneath today's suburbs of Ain Shams, which means 'eye of the sun' in Arabic, and the adjacent area of Matariya. (Aladin Abdel Naby/Reuters)

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