This is what Chengdu in Western China looked like 70 years ago. There are several clips of Chengdu on YouTube that show it is a modern city now. I improvised the soundtrack. A contributor elucidated: This is the AnLan Bridge, built during the construction of the DuJiangYan 都江堰 weir works by LiBing 李冰 governor of newly conquered Shu 蜀 (SiChuan) from the ancient state of Qin 秦国 (for which China is claimed to be named after) on the Min River 岷江 that feeds into the ChengDu plain. The bridge itself has been rebuilt more than once, yet the earthworks of the location are thousands of years old and are still in use. The structure of DuJiangYan 都江堰 is noted to be the world's most labor intensive hydrological project, as mountains were drilled through using heat treatment of fire and water in an age before gunpowder, further still, a cleaver system of splitting the river into two parts of varying depths to cause a change in flow rate lead to debris floating into the 'outer partition' so that people could receive relatively clean water. Most individuals, even experts, refer to the aqueducts or Great canal further east for examples of human impact on estuaries, few know of the small bridge show four and a half minutes in.
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Website 'Man and the Unknown' http://wichm.home.xs4all.nl/