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National Historic Landmarks are designated places that hold significant value in illustrating the nation's history. They are carefully selected based on their ability to tell a story about the past, and they can take various forms such as buildings, structures, districts, sites, and objects. These landmarks often showcase exceptional architectural or engineering methods, or they may be associated with historical events, activities, or prominent figures in American history. As a part of the broader category of Historic Districts, National Historic Landmarks contribute to the rich tapestry of American history and heritage, providing valuable insights into the country's evolution over time.