NPS exhibited part of one of the walls inside Castle Clinton. See also List of national monuments of the United States List of New York City Designated Landmarks in Manhattan below 14th Street National Register of Historic Places listings in Manhattan below 14th Street References Notes Citations Sources External links Castle Clinton from GORP The Battery Conservancy CastleGarden.org, searchable database of 13.3 million immigrants arriving in New York before 1892 (90% complete) 1811 establishments in New York (state) The Battery (Manhattan) Forts in Manhattan Forts on the National Register of Historic Places in New York (state) History museums in New York City IUCN protected area errors John McComb Jr. buildings Military facilities on the National Register of Historic Places in Manhattan Military installations established in 1808 Monuments and memorials in Manhattan Museums in Manhattan National Park Service National Monuments in New York City New York City Designated Landmarks in Manhattan