Ancient Great Wall sites found in N.W. China

Several ancient Great Wall sites from different periods were found in northwestern China's Gansu Province after a survey of the Great Wall within the province began in 2007, according to news from the Gansu Cultural Relics Bureau on April 21.
These Great Wall sites were separately built during the Qin Dynasty (221 BC - 206 BC), Han Dynasty (206 B.C.–220 A.D.) and Ming Dynasty (1368 A.D. – 1644 A.D.).
In 2007, a team surveyed nearly 1,000 kilometers of Gansu Province; and discovered three segments of wall and moats, and six barriers and four beacon towers in Tianzhu County, Liangzhou District and Jinta County.
These sites, found in the wild and previously not documented, were named after their locations.
Gansu Province's Great Wall sites include the work of five dynasties, with a total length of 4,000 kilometers of wall. Moreover, heads of the Great Wall, built during the Qin Dynasty, Han Dynasty and Ming Dynasty, are located in Gansu.
By People's Daily Online