Associated Press
Pedestrians make their way across the Zocalo plaza in downtown Mexico City, Tuesday, Nov. 20, 2012. The Zocalo was the center of the Aztec island empire that became Mexico City after the Spanish conquest, and it remains the heart of the capital. The massive open plaza is bounded by Mexico City's main cathedral, along with the National Palace that houses the federal government and the ruins of the Templo Mayor, which was the central temple of the ancient Aztecs. Entrance to the cathedral and part of the National Palace are free, and the Zocalo itself is often filled with open-air entertainment, with street vendors, painted Aztec dancers, traditional healers and the occasional political demonstration all competing for attention. (AP Photo/Alexandre Meneghini)

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