Photo taken on Dec 2, 2014 shows a performing stage in the Forbidden City of Beijing, capital of China. China's performing stage is an essential part of traditional Chinese architecture. Most well-preserved ancient stages were built in Ming Dynasty (1368-1644) and Qing Dynasty (1644-1911). It generally consists of indoor and outdoor types. The main construction materials are wood, brick and stone. Its unique acoustics property has become an important object for experts. [Photo/Xinhua]