A man takes photos of a cultural relic during a historic and cultural exhibiton of Qi(1046BC-221BC), an ancient Chinese state during the Zhou Dynasty of ancient China, in Xi'an, capital of Northwest China's Shaanxi province, July 16, 2015. The exhibition, displaying a total of 194 cultural relics, opened here Thursday and will last until Oct 16 this year. [Photo/Xinhua]