Photo taken on Sept. 1, 2014 shows the north gate of Songzhou Ancient City in Songpan County, southwest China's Sichuan Province. Songzhou Ancient City, with a history of over 2,000 years, used to be a place of significant military importance and acted as a trade center in southwest border areas. The local government has issued a renovation project for the city since 2003, making it a tourist spot of traditional culture. (Xinhua/Jiang Hongjing)