John Davies photographed industrial landscapes—associated with coal mining, cotton mills, and shipping—in 1981 and 2019. The before-and-after pairs are in his new book, “Retraced 81/19,” published by @Gost Books. Follow the link in our bio to see more of these transformed landscapes on #PDNPOTD. [Photos: “Queens Graving Dock, Liverpool, England 1986”; “The Keel, Former Graving Dock, Liverpool, England 2019.” © John Davies]