Christopher Cox, grandson of former U.S. President Richard Nixon and his wife Andrea Catsimatidis pose with a pair of Chinese twin sisters for photos as they tour the Great Wall of China at Badaling, north of Beijing, Saturday, May 4, 2013. A delegation led by Cox and former U.S. officials is here to commemorate the late U.S. President's centennial by retracing the 1972 historical visit to China. [Photo: Imagine China/ Andy Wong]

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