National Historic Landmark

USS Constitution 1997 2017071413 5968c444bb9e5

A National Historic Landmark (NHL) is a building, site, structure, or object that is officially recognized by the United States government for its national-level historical significance. Out of more than 85,000 places on the National Register of Historic Places only about 2,500 are NHLs. A National Historic Landmark District (NHLD) is a historic district that has received similar recognition.

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