 Bridges over waterways had been known in China since the ancient Zhou dynasty . During the Song dynasty , large <unk> bridges were constructed , such as that built by Zhang <unk> in <unk> . There were also large bridges made entirely of stone , like the Ba <unk> Bridge of Shaoxing , built in <unk> and still standing today . Bridges with pavilions crowning their central spans were often featured in such paintings as the landscapes of Xia Gui ( <unk> – 1224 ) . Long , covered corridor bridges , like the 12th @-@ century Rainbow Bridge in <unk> , <unk> province , which has wide stone @-@ based piers and a wooden superstructure , were also built . 
