Castle Clinton National Monument

Castle Clinton is a restored circular sandstone fort within Battery Park at the southern end of Manhattan in New York City, United States. Built from 1808 to 1811, it was the first American immigration station, predating Ellis Island. More than 7.5 million people arrived in the United States at Fort Clinton between 1855 and 1890. Over its active life, it has also functioned as a beer garden, exhibition hall, theater, and public aquarium. The structure is a New York City designated landmark and a U.S. national monument, and it is listed on the National Register of Historic Places.