Tourists walk on a street in Lijiang, southwest China's Yunnan Province in this file photo taken on April 25, 2010. The old town of Lijiang was formally licenced as the national 5A tourism attraction spot, the top one among China's tourism ranking system, on July 27, 2011, after it passed the evaluation recently. With a history of more than 800 years, the old town of Lijiang, a UNESCO World Heritage site, is one of the surviving ancient towns in China.[Photo/Xinhua]