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Aswan Low Dam WorkersLabourers commencing masonry work on the western channel of the Aswan dam, circa 1900. Designed by British engineer Sir William Willcocks, the dam was completed in 1902. (Photo by D.S)
Cologne CathedralA stereoscopic view of the south side of Cologne Cathedral during its completion, Germany, circa 1870. (Photo by Hulton Archive/Getty Images)
