Fort Carroll, located in the Patapsco River near Baltimore, Maryland, is a historic abandoned sea fort named after Charles Carroll of Carrollton. Built in 1848 under the supervision of Brevet-Colonel Robert E. Lee, the hexagonal structure was part of the Permanent System construction program to defend important ports in America.
Despite its military history during the Civil War and Spanish American War, Fort Carroll was eventually abandoned by the Army in 1921. Today, the fort stands deserted on its 3.4-acre artificial island, serving as a habitat for wildlife and a destination for urban explorations.
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