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Introduction to Darong Bridge: Darong Bridge is 116 meters long, 1.8 meters wide and 0.5 meters thick. It is a cultural relic protection unit in Chongqing. The bridge is paved with huge stone slabs, each of which weighs about four to five tons and is thick and stable. There are protective piers on both sides of the bridge deck. There were original stone carvings of dragon heads and tails on the bridge piers, but now only the dragon tails remain. On the rough bridge deck, the footprints of carriages and people are clearly visible, seeming to tell the vicissitudes of Lukong Ancient Town.