Fort Warren is a historic fort on the 28-acre Georges Island at the entrance to Boston Harbor. It is not to be confused with Fort Winthrop, which was named Fort Warren from 1808 to 1833.
Fort Warren is a pentagonal bastion fort, made with stone and granite, and was constructed from 1833–1861, completed shortly after the beginning of the American Civil War. Fort Warren defended the harbor in Boston, Massachusetts, from 1861 through the end of World War II, and during the Civil War served as a prison for Confederate officers and government officials. The fort remained active through the Spanish–American War and World War I, and was re-activated during World War II. It was permanently decommissioned in 1947, and is now a tourist site. It was designated a National Historic Landmark in 1970 as a masterpiece of coastal engineering of the pre-Civil War period, and for its role in the Civil War.
Fort Warren can be found on Georges Island and accessed from early May until late October by a ferry. For more information regarding the ferry schedule, see the Boston Harbor Islands website.
More information on Boston Harbor Islands http://www.bostonharborislands.org/georges
Coordinates 42°19'12.839" N -70°55'39.5" E