Located at the northern tip of Michigan where Lake Superior, Lake Michigan, and Lake Huron join together, the Sault Ste. Marie Hydroelectric Power Complex was built to harness the hydroelectric potential of the 20-foot falls at the headwaters of the St. Marys (sic) River, the sole outlet of Lake Superior. A century after its construction, the plant remains the largest low-head hydroelectric facility in the United States. Today, the Sault Ste. Marie plant supplies electricity to area residents, especially those in the Upper Peninsula of Michigan.
Noble, Alfred

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Image Credit: Courtesy Flickr/Madison Berndt (CC BY 2.0)Image Caption: Sault Ste. Marie Hydroelectric ComplexEra_date_from: 1902
1983

Galveston Island is a barrier island located two miles off the Texas coast. The island is about 3 miles wide at its widest and about 28 miles long. The Galveston Seawall extends over 10 miles along Galveston's oceanfront, protecting life and property against hurricanes and tropical storms.
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Image Credit: Courtesy Flickr/Ed Schipul (CC BY-SA 2.0)Image Caption: Galveston Seawall and Grade RaisingEra_date_from: 1911
2001