A worker pushes a wheelbarrow through a recently discovered archeological site in Mexico City, Friday, July 13, 2012. According to Mexico's National Institute of Anthropology and History, INAH, the site is about 700 years old and is a neighborhood of the Tepaneca merchants. (AP Photo/Alexandre Meneghini)

Associated Press
A worker pushes a wheelbarrow through a recently discovered archeological site in Mexico City, Friday, July 13, 2012. According to Mexico's National Institute of Anthropology and History, INAH, the site is about 700 years old and is a neighborhood of the Tepaneca merchants. (AP Photo/Alexandre Meneghini)
A worker pushes a wheelbarrow through a recently discovered archeological site in Mexico City, Friday, July 13, 2012. According to Mexico's National Institute of Anthropology and History, INAH, the site is about 700 years old and is a neighborhood of the Tepaneca merchants. (AP Photo/Alexandre Meneghini)
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