Visitors view the photos on an exhibition entitled "Tibet of China: Past and Present" in New York, the United States, March 28, 2009. The photo exhibition and a symposium marking the 50th anniversary of the emancipation of Tibetan serfs was held here on Saturday. (Xinhua/Gu Xinrong)

A symposium marking the 50th anniversary of the emancipation of Tibetan serfs and a photo exhibition entitled "Tibet of China: Past and Present" is held in New York, the United States, March 28, 2009. (Xinhua/Gu Xinrong)