National Historic Landmark

A National Historic Landmark (NHL) is a building, site, structure, or object that is officially recognized by the United States government for its outstanding degree of historical significance. Out of over 85,000 places that have been listed on the country’s National Register of Historic Places only about 2,500 are recognized as National Historic Landmarks. 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.