Zhaozhou Bridge over Xiao River 洨河[Xiao2 He2] in Zhao county 趙縣|赵县[Zhao4 Xian4], Shijiazhuang, Hebei, dating back to the Sui dynasty 隋代[Sui2 dai4] (581-617) and the world's oldest extant stone arch bridge
surname Zhao / one of the seven states during the Warring States Period (476-220 BC) / the Former Zhao 前趙|前赵[Qian2 Zhao4] (304-329) and Later Zhao 後趙|后赵[Hou4 Zhao4] (319-350), states of the Sixteen Kingdoms