Photo taken on July 22, 2013 shows people visiting the ruins of Suoyang City in Guazhou County, northwest China's Gansu Province. Suoyang, which dates back to the Han Dynasty (202 BC-220 AD), was an ancient city on the Silk Road. The famous ancient Silk Road, which served as a corridor for trade and cultural exchanges between Asia and Europe dating back to 2,000 years ago, was inscribed on the World Heritage list at Doha, capital of Qatar on June 22, 2014. Jointly submitted by China, Kazakhstan and Kyrgyzstan, the application for adding part of the millennium-old trade route to the UNESCO list was approved by the World Heritage Committee which convened its 38th session in Doha. (Xinhua)