The remains of the E. I. du Pont de Nemours and Company gunpowder mills that line the Brandywine Creek are now part of the Hagley Museum near Wilmington, De., on 1 September 2017.The Brandywine Creeek falls from about 160 feet above sea level in Chadds Ford, Pa to just a few feet above sea level in Wilmington. The steep descent created the powered that ran the original DuPont gunpowder mills. Photograph by Jim Graham
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