This fort was built from 1833 to 1861, to defend Boston Harbor.
Union troops first garrisoned the fort in April 1861. During the Civil War the fort was a training camp for Union recruits and a prisoner-of-war camp.
Fort Warren served as a mine control center during World War I.
In the Second World War, the fort served as a control center for Boston Harbor's south mine field. Is also served as a prisoner-of-war camp.
Nowadays the fort is open to the public.
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