5. The Site of Fort Amsterdam is Now the U.S. Custom House

The Alexander Hamilton U.S. Custom House was designed by Cass Gilbert and built from 1902-07 by the Federal Government to house the operations for the Port of New York. It was built atop former steamship offices, in the general vicinity of Fort Amsterdam, which had long been demolished
The building now houses The National Museum of the American Indian (since 1994), The U.S. Bankruptcy Court, an office of U.S. Customs and Border Patrol, and as of February 2013, home of The National Archives at New York City. This is quite a fitting location for the Archives, since they maintain historically significant records dating back to 1685. The National Archives is open to the public, with a small exhibition gallery. They also maintain a Research Center for school groups, educators and the public. The 45,000 square foot, seven-story building is listed in the National Register of Historic Places (1972), designated a National Historic Landmark (1976), and in 1979 the exterior and public interior spaces became City Landmarks.