An archeological worker preserves original embellishment on a piece of terracotta warrior with special chemical method at the Emperor Qinshihuang's Mausoleum Site Museum in Xi'an, capital of northwest China's Shaanxi province, July 18, 2013. The 2,200-year-old mausoleum was discovered in Lintong district, 35 km east of Xi'an, in 1974 by peasants who were digging a well. The Chinese terracotta army buried around the mausoleum was one of the greatest archeological finds of modern times.[Photo/Xinhua]