Photo taken on Nov. 21, 2011 shows the ruins of a part of the west wall of a Han Dynasty (202 B.C.-220 A.D.) city unearthed in Shangboguan Village in Shenyang, capital of northeast China's Liaoning Province. Archaeologists recently discovered the Han Dynasty city at a construction site of the fourth ring road in the outskirts of Shenyang. (Xinhua/Zhang Wenkui)

A photographer take pictures of the ruins of a Han Dynasty (202 B.C.-220 A.D.) city unearthed in Shangboguan Village in Shenyang, capital of northeast China's Liaoning Province, Nov. 21, 2011. Archaeologists recently discovered the Han Dynasty city at a construction site of the fourth ring road in the outskirts of Shenyang. (Xinhua/Zhang Wenkui)

Photo taken on Nov. 21, 2011 shows the ruins of a part of the south wall of a Han Dynasty (202 B.C.-220 A.D.) city unearthed in Shangboguan Village in Shenyang, capital of northeast China's Liaoning Province. Archaeologists recently discovered the Han Dynasty city at a construction site of the fourth ring road in the outskirts of Shenyang. (Xinhua/Zhang Wenkui)

Photo taken on Nov. 21, 2011 shows the ruins of a Han Dynasty (202 B.C.-220 A.D.) city unearthed in Shangboguan Village in Shenyang, capital of northeast China's Liaoning Province. Archaeologists recently discovered the Han Dynasty city at a construction site of the fourth ring road in the outskirts of Shenyang. (Xinhua/Zhang Wenkui)

Photo taken on Nov. 21, 2011 shows the excavation site of the ruins of a Han Dynasty (202 B.C.-220 A.D.) city unearthed in Shangboguan Village in Shenyang, capital of northeast China's Liaoning Province. Archaeologists recently discovered the Han Dynasty city at a construction site of the fourth ring road in the outskirts of Shenyang. (Xinhua/Zhang Wenkui)

Photo taken on Nov. 21, 2011 shows the excavation site of the ruins of a Han Dynasty (202 B.C.-220 A.D.) city unearthed in Shangboguan Village in Shenyang, capital of northeast China's Liaoning Province. Archaeologists recently discovered the Han Dynasty city at a construction site of the fourth ring road in the outskirts of Shenyang. (Xinhua/Zhang Wenkui)