Prior to 1935, efforts to preserve cultural heritage of national importance were made by piecemeal efforts of the United States Congress. In 1935, Congress passed the Historic Sites Act, which authorized the interior sec… See more

NHLs are designated by the United States secretary of the interior because they are:
• Sites where events of national historical significance occurred;
• Places where prominent persons lived or worked;… See more

More than 2,500 NHLs have been designated. Most, but not all, are in the United States. There are NHLs in all 50 states and the national capital of Washington, D.C. Three states (Pennsylvania… See more

• American Water Landmark
• Listed building, a similar designation in the UK
• List of churches that are National Historic Landmarks in the United States… See more

• Mackintosh, Barry (1985) "The Historic Sites Survey and National Historic Landmarks Program: A History", published by the National Park Service, provides a much more complete accounting of the history lead… See more