Designated 11/23/1965
Castle Clinton is one of New York City’s notable harbor forts. It is an outstanding example of early 19th century military architecture in this country. Although none of the 28 guns of the fort ever fired a shot in a military engagement, the fort was important for the protection of New York City during the War of 1812. In 1845 the fort was covered by a domed roof and served as the City’s principal hall for the performance of opera and concerts. In 1855 it became a depot for immigration, and approximately 7,500,000 immigrants passed through its doors.