On Friday, when the Zuojiang Huashan Rock Art Cultural Landscape in southern Guangxi Zhuang autonomous region was added to UNESCO's world heritage list, an exhibition in Beijing kicked off to show people its cousin in Northwest China's Ningxia Hui autonomous region.

Ancient Echo: The Special Exhibition of Ningxia Rock Art opened in the capital's Overseas Chinese Museum of China, and will run through Sept 15.

About 60 rubbings and ancient stone carvings from the Helan Mountains are on display.