United States
40.7030°, -74.0170°
1946
0.004
Castle Clinton National Monument preserves a circular sandstone fort built in 1811 to defend New York Harbor during the War of 1812. Located in Battery Park at the southern tip of Manhattan, the structure later served as an immigration station before Ellis Island opened. Managed by the National Park Service, it processed over 8 million immigrants between 1855 and 1890. The monument now serves as a museum and ticket office for Statue of Liberty and Ellis Island ferries.