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Visit Harbor Defense Museum
The Harbor Defense Museum, sometimes called The Caponier, located within the grounds of Fort Hamilton in the Bay Ridge section of Brooklyn is a 19th-century fort, New York City's only military museum and one of only seventy military museums in the United States that is funded and operated by the Defense Department.
Fort Hamilton is the "second-oldest continuously garrisoned federal post in the nation", second only to West Point and its ties to the community are part of the charm of the museum and the fort. Although The Caponier was always prepared for battle, with a 24-pound cannon aimed at New York Harbor, the fort never experienced a battle. The museum houses an array of artifacts from New York's military history including American Revolutionary War relics, uniforms from various wars, old maps of the fort, the post's old switchboard, an exhibit on a secret tunnel that connected Fort Hamilton with another base a half-mile away, a Confederate mine and a piece of the net that protected New York Harbor from German U-boats in World War I. It is also the temporary home of a Bay Ridge time capsule that was unearthed prematurely due to construction.