File photo shows a mini pottery millstone unearthed from tombs dating from the Han Dynasty (202 B.C.-220 A.D.) in Zhengzhou, central China's Henan Province. Archaeologists in central China's Henan Province have discovered 160 ancient tombs. The tombs are believed to have been built during the Han Dynasty (202 B.C.-220 A.D.). More than 1,000 cultural relics were unearthed from the tombs, including bronzeware, ironware and pottery. Many ancient coins were also discovered. (Xinhua)