National Park Service
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Alcatraz (San Francisco County, California)
Beaver Creek Bridge (Custer County, South Dakota)
Open-spandrel arch bridge over Beaver Creek on SD 87
Camp 4 (Mariposa County, California)
Camp Chase Cemetery (Franklin County, Ohio)
Confederate cemetery located on the west side of Columbus
Cow Camp (San Bernardino County, California)
Crystal Cave District (Edmonson County, Kentucky)
Maintained but un-staffed. Cave closed to the public. Entry by permit only.
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