 National Historic Sites, National Historical Parks, some National Monuments, and certain other areas listed in the National Park System are historic landmarks of national importance that are highly protected already, often before the inauguration of the NHL program in 1960, and are then often not also named NHLs "per se".There are three of these in Alaska.The National Park Service lists these three together with the NHLs in the state,

Cape Krusenstern National Monument is also an NHL and is listed above.