A National Historic Landmark (NHL) is a building, site, structure, or object that is officially recognized by the United States government for its historical significance. Out of more than 80,000 places on the National Register of Historic Places only about 2,430 are NHLs.
A National Historic Landmark District (NHLD) is a historic district that has received similar recognition. The district may include contributing properties that are buildings, ...
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A National Historic Landmark (NHL) is a building, site, structure, or object that is officially recognized by the United States government for its historical significance. Out of more than 80,000 places on the National Register of Historic Places only about 2,430 are NHLs.
A National Historic Landmark District (NHLD) is a historic district that has received similar recognition. The district may include contributing properties that are buildings, structures, sites or objects, and it may include non-contributing properties. Contributing properties may or may not also be separately listed.
Prior to 1935, efforts to preserve cultural heritage of national importance were made by piecemeal efforts of the United States Congress. In 1935 Congress passed the Historic Sites Act, which formally granted the Interior Secretary authority to formally record and organize historic properties, and to designate properties as having "national historical significance", and gave the National Park Service...
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