Outstanding Natural Area is a protected area designation in the United States. The designations are managed by the Bureau of Land Management within the National Landscape Conservation System. There are a number of outstanding natural areas and open space reserves in the country, three of which have lighthouses.
The following is a partial list of ONAs.
The Devil's Garden and Phipps-Death Hollow are also known as Wilderness Study Areas.
References
Outstanding Natural Area Wikipedia(Text) CC BY-SA