Pianist Lang Lang, who is also a UN Messenger of Peace, performs during a concert entitled "Lang Lang and Friends" in commemoration of the UN Day, at the UN headquarters in New York, on Oct 24, 2014. The United Nations celebrated its 69th birthday with its messenger of peace, world-renowned pianist Lang Lang performing at a concert on Friday evening. [Photo/Xinhua]

Photo taken on Oct 26, 2014 shows the colorful autumn scenery at Qilian Mountains, which is located in Zhangye, Gansu province. Snow on the mountain, red leaves, vast grasslands and green pine trees all combine to make Qilian Mountains a perfect getaway in autumn.[Photo/Xinhua]