Luoyang's clock starts at Erlitou, a capital-level settlement of around 1700 BCE holding the earliest known palace enclosure and grid road system in China, some six centuries before the Zhou built their capitals at Fenghao. Second-placed Zhengzhou still has stretches of its Shang city wall, nearly seven kilometres around, standing above ground between modern high-rises.
What is rare is not age but continuity: Anyang's Yinxu was abandoned when the Shang fell, and Fenghao and Jinancheng survive only as ruins, while Suzhou (514 BCE) and Chengdu (311 BCE), though seven to ten centuries younger, have kept both their name and their site for more than two millennia. Ranks five and six are genuinely inseparable: Beijing and Linzi both trace to roughly 1045 BCE, when the Zhou king enfeoffed the states of Yan and Qi in the same round of grants.
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