A visitor walks by the Teotihuacan culture Disk with a Skull at the temporary exhibition 'Isis and the feathered serpent' in Monterrey, September 21, 2007. Ancient Mexicans and Egyptians, who never met and lived centuries and thousands of miles apart, both worshiped feathered-serpent deities, built pyramids and developed a 365-day calendar, a new exhibition shows. Picture taken September 21, 2007. REUTERS/Tomas Bravo (MEXICO)