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National Historic Landmarks are historic districts that have been designated by the United States government as having significant historical value and worthy of preservation. These landmarks can include buildings, structures, objects, and districts that represent important aspects of American history, culture, and heritage. They may encompass a wide range of places, such as homes, businesses, parks, and battlefields, that have played a crucial role in shaping the nation's past. As part of the broader category of historic districts, National Historic Landmarks are subject to special protections and regulations aimed at preserving their historical integrity for future generations.