Xian houses China's best-preserved city wall, built in the Ming dynasty as an extension of an old Tang dynasty structure. With a length of 14 kilometres, the wall, surrounding the city centre, is one of many historical relics in the capital of northwestern Shaanxi province. Like the city's other industries, protection and development of historic relics also faces a funding problem. The Museum of the Terra Cotta Warriors and Horses of Qin Shihuang is undergoing its second phase of expansion, which covers construction of two exhibition halls for the second and third excavation pits and a service building. The museum's reception director, Meng Jianming, said the museum had invested 70 million yuan (about HK$65.05 million) in the project but still faced a shortfall of about 70 million yuan. The museum has largely funded the project from its own resources, which it has supplemented with loans from the central tourism bureau and a cash grant from the provincial government. Initially, Beijing estimated the project would cost only 48.5 million yuan, but 100 million yuan already has been spent. 'We will have to rely on our own resources because the Government has said it will give us no more money,' Mr Meng said. With an annual income of about 50 million yuan, he said the museum had about 15 million to 20 million yuan a year on hand for the development. 'As a museum, we are still better than other museums because we have many visitors. But if you are talking about buying modern equipment and bringing in foreign technology, we don't have many funds for that,' Mr Meng said. Last year, a total of 350,000 foreigners and 1.2 million mainlanders visited the museum.