File photo taken on March 12, 2011, shows tourists visiting the Dr. Sun Yat-sen's Mausoleum in Nanjing, capital of east China's Jiangsu Province. The Dr. Sun Yat-sen's Mausoleum, a burial site of Dr. Sun Yat-sen, a great democratic revolution pioneer in China, will undergo renovation and maintenance from June 1 to 20, during which the mausoleum will be partly closed. Photo: Xinhua