File photo provided by the heritage management center in Yangquan City of north China's Shanxi Province shows a piece of wooden slab unearthed from a 2,000-year-old well recently found in the province. An ancient nine-sided well, bearing a wooden structure, with a history of over 2,000 years was discovered in north China's Shanxi Province, archaeologists announced Tuesday. (Heritage management center in Yangquan City/Handout via Xinhua)
