Free Admission Tuesday at Federal Hall National Memorial - see INFO below. Manhattan Historic Sites Archive Learn more about Federal Hall National Memorial, and other National Park Service sites in Manhattan, at the Manhattan Historic Sites Archive! This archive is comprised of items related to the important individuals and events associated with six National Park Service historic sites in Manhattan (Federal Hall N. Mem., General Grant N. Mem., Hamilton Grange N. Mem., Theodore Roosevelt Birthplace N.H.S., Castle Clinton N.M., and Saint Paul's Church N.H.S.) and to the creation and preservation of these sites. The materials are diverse in type, ranging from photographs, to letters, to maps and prints. This three-year project to catalog, reorganize, and digitize the collections was funded by the National Parks of New York Harbor Conservancy through a grant from the Leon Levy Foundation. Materials were chosen for digitization based on a variety of factors, including both informational and visual content, fragility, and aesthetic qualities. To visit the website and explore this archive, please click here. More Info below.