Stone riverbank of Dongbuya Bridge, Beijing. Yuan Dynasty (1206-1368). Unearthed at Dongbuya Bridge, Dongcheng District, Beijing.
<a href="//commons.wikimedia.org/wiki/User:BabelStone" title="User:BabelStone">BabelStone</a>
CC BY-SA 3.0
<span class="int-own-work" lang="en">Own work</span>