A National Historic Landmark (NHL) is a designation given by the United States government to sites that hold exceptional historical significance. These landmarks represent important aspects of American history, culture, or architecture and are recognized for their national importance. The NHL program is managed by the National Park Service, which helps preserve these sites for future generations. To qualify as a National Historic Landmark, a site must meet specific criteria, including its association with significant events, activities, or individuals in American history. Examples of NHLs include historic buildings, battlefields, and archaeological sites, such as the Statue of Liberty and Independence Hall.