Great Wall towers found

　　ARCHEOLOGISTS have discovered the ruins of 30 unrecorded Great Wall beacon towers during a recent field study in Gansu Province.During the study, two fortified castles and two auxiliary buildings were also discovered.Known as the “Great Wall museum,” Gansu is the site of Great Wall sections built in the Warring States Period (475 B.C.-221 B.C.) and successive Qin, Han and Ming dynasties. The wall sections built in the Han Dynasty (206 B.C.-A.D. 220) are among the best preserved.During the month-long study, the archeologists walked more than 2,000 kilometers along the Great Wall built in the Han Dynasty in Gansu. This was the first study for 30 years of the Great Wall sections built in the Han Dynasty. <2001>(Xinhua)