Owned by federal government

1790 Footprints (Hawaii County, Hawaii)
4 Lazy F Dude Ranch (Teton County, Wyoming)
A. R. Carroll Building (Washington County, Arkansas)
Abandoned Route 66 - Ash Fork Hill (Coconino County, Arizona)
Abandoned Route 66 - Parks (1921) (Coconino County, Arizona)
Abandoned Route 66 - Parks (1931) (Coconino County, Arizona)
Acting Superintendent's Headquarters (Mariposa County, California)
Adams National Historic Site (Norfolk County, Massachusetts)
Administration Building (Sedgwick County, Kansas)
Administration Building (Valley County, Montana)
Administration Building, Old (Garfield County, Utah)
Administration Building, Sherman Institute (Riverside County, California)
Administration Building, Treasure Island (San Francisco County, California)
Admiral's House (New York County, New York)
Agate House Pueblo (Navajo County, Arizona)
Agnes Vaille Shelter (Larimer County, Colorado)
Aguayo Family Homestead (Lincoln County, New Mexico)
Ah Toy Garden (Idaho County, Idaho)
Ahearn House and Summer House (Barnstable County, Massachusetts)
Ahwahnee Hotel (Mariposa County, California)
Ainahou Ranch (Hawaii County, Hawaii)
Ainapo Trail (Hawaii County, Hawaii)
Aker Cemetery (Clay County, Missouri)
Alaska Central Railroad: Tunnel No. 1 (Kenai Peninsula Borough, Alaska)
Albert Cofta Farmstead (Summit County, Ohio)
Albertville (Former) U.S. Post Office (Marshall County, Alabama)
Built in 1931 under Andreew Mellon, now serving the Board of Education
Alcatraz (San Francisco County, California)
Aldridge Sawmill (Jasper County, Texas)
Alex Cole Cabin (Sevier County, Tennessee)
Alexander Lake Shelter Cabin (Hoonah-Angoon Census Area, Alaska)
Alexandria National Cemetery (Rapides Parish, Louisiana)
Alexandria National Cemetery (Alexandria, Virginia)
Alice Creek Historic District (Lewis and Clark County, Montana)
Allee House (Kent County, Delaware)
Allegheny River Lock and Dam No. 2 (Allegheny County, Pennsylvania)
Allegheny River Lock and Dam No. 3 (Allegheny County, Pennsylvania)
Allegheny River Lock and Dam No. 4 (Allegheny County, Pennsylvania)
Allegheny River Lock and Dam No. 5 (Armstrong County, Pennsylvania)
Allegheny River Lock and Dam No. 6 (Armstrong County, Pennsylvania)
Allegheny River Lock and Dam No. 7 (Armstrong County, Pennsylvania)
Allegheny River Lock and Dam No. 8 (Armstrong County, Pennsylvania)
Allegheny River Lock and Dam No. 9 (Armstrong County, Pennsylvania)
Allen Gulch Mill (Josephine County, Oregon)
Allen Gulch Townsite (Josephine County, Oregon)
Allen--Madison House (Washington County, Rhode Island)
Allentown Bridge (Apache County, Arizona)
Abandoned pratt deck truss bridge over Puerco River on Former alignement of Allentown Road (Old US 66)
Alley Spring Roller Mill (Shannon County, Missouri)
Allison Ranger Station (Harney County, Oregon)
ALMA (Scow Schooner) (San Francisco County, California)
Alpena Light (Alpena County, Michigan)
Alta Ranger Station (Ravalli County, Montana)
Altair Campground Community Kitchen (Clallam County, Washington)
Aluakpak (North Slope Borough, Alaska)
American Flag Post Office Ranch (Pinal County, Arizona)
American Peace Society (Washington, District of Columbia)
American Revolution Statuary (Washington, District of Columbia)
American Trona Corporation Building (Los Angeles County, California)
AMK Ranch (Teton County, Wyoming)
Ammo Bunker (S-1007) (Maricopa County, Arizona)
Ammo Bunker (S-1008) (Maricopa County, Arizona)
Ammunition Igloo (Jefferson County, Colorado)
Anacapa Island Light Station (Ventura County, California)
Anderson Lodge (Park County, Wyoming)
Andersonville National Historic Site (Unspecified county, Georgia)
Andrew Berg Cabin (Kenai Peninsula Borough, Alaska)
Andrew Johnson National Historic Site (Greene County, Tennessee)
Andrew Snable House (Sussex County, New Jersey)
Angels Landing Trail-West Rim Trail (Washington County, Utah)
Aniakchak Bay Historic Landscape District (Dillingham Census Area, Alaska)
Annapolis National Cemetery (Anne Arundel County, Maryland)
Annisquam Harbor Light Station (Essex County, Massachusetts)
Ant Flat Ranger Station (Lincoln County, Montana)
Antigo Post Office (Langlade County, Wisconsin)
Antlers Guard Station (Baker County, Oregon)
Anton Schoenberger Homestead (Flathead County, Montana)
Anvil Lake Campground Shelter (Vilas County, Wisconsin)
Apgar Fire Lookout (Flathead County, Montana)
Apollo Mission Control Center (Harris County, Texas)
Apostle Islands Lighthouses (Unspecified county, Wisconsin)
Appleton Lock 4 Historic District (Outagamie County, Wisconsin)
One of seventeen locks on the lower Fox River
Appleton Locks 1--3 Historic District (Outagamie County, Wisconsin)
Aquatic Park Historic District (San Francisco County, California)
Arcade Building (Buncombe County, North Carolina)
Arctic Point Fire Lookout (Idaho County, Idaho)
Arkansas Post National Memorial (Arkansas County, Arkansas)
Arlington House, The Robert E. Lee Memorial (Arlington County, Virginia)
Arlington Memorial Bridge (Washington, District of Columbia)
Armed Forces Retirement Home--Washington (Washington, District of Columbia)
Army Medical Museum (Washington, District of Columbia)
Arrastra Site (Comanche County, Oklahoma)
Arrowhead Lodge (Larimer County, Colorado)
Arrowrock Dam (Boise County, Idaho)
Arts and Industries Building (Washington, District of Columbia)
Ash Mountain Entrance Sign (Tulare County, California)
Ashcroft, Colorado (Pitkin County, Colorado)
Ashland Harbor Breakwater Light (Ashland County, Wisconsin)
A hexagonal reinforced concrete tower at the foot of the Ashland breakwater.
Ashtabula Harbor Light (Ashtabula County, Ohio)
Assateague Lighthouse (Accomack County, Virginia)
Atascosa Lookout House (Santa Cruz County, Arizona)
Atchison Post Office (Atchison County, Kansas)
Au Sable Light Station (Alger County, Michigan)
Auditor's Building Complex (Washington, District of Columbia)
Austin Pass Warming Hut (Whatcom County, Washington)
Austin US Courthouse (Travis County, Texas)
Ava Ranger Station Historic District (Douglas County, Missouri)
Avery Ranger Station (Shoshone County, Idaho)
Aztec Ruins Administration Building--Museum (San Juan County, New Mexico)
Aztec Ruins National Monument (San Juan County, New Mexico)
B-17G "Flying Fortress" No. 44-83690 (Miami County, Indiana)
Badger Mountain Lookout (Douglas County, Washington)
Bagby Guard Station (Clackamas County, Oregon)
Bagby Stationhouse, Water Tanks and Turntable (Mariposa County, California)
Wooden turntable and station house from the defunct Yosemite Valley RR.
Baker Highway Maintenance Station (Tuolumne County, California)
Baker Island Light Station (Hancock County, Maine)
Baker Ranger Station (White Pine County, Nevada)
Baker's Island Light Station (Essex County, Massachusetts)
BALCLUTHA (San Francisco County, California)
Baldwin Estate (El Dorado County, California)
Baltimore Light Station (Anne Arundel County, Maryland)
Baltimore--Washington Parkway (Prince George's County, Maryland)
Bamberg Post Office (Bamberg County, South Carolina)
Historic post office building in Bamberg, SC
Bandelier CCC Historic District (Unspecified county, New Mexico)
Bandelier National Monument (Sandoval County, New Mexico)
Bandit Rock (Unspecified county, California)
Bar B C Dude Ranch (Teton County, Wyoming)
Bard Springs Bathhouse (Polk County, Arkansas)
Bard Springs Dam No. 1 (Polk County, Arkansas)
Bard Springs Dam No. 2 (Polk County, Arkansas)
Bard Springs Picnic Shelter (Polk County, Arkansas)
Barfoot Lookout Complex (Cochise County, Arizona)
Barker Dam (Riverside County, California)
Barksdale Field Historic District (Bossier Parish, Louisiana)
Barrancas National Cemetery (Escambia County, Florida)
Barton-Lackey Cabin (Tulare County, California)
Basalt Cobblestone Quarries District (Clark County, Washington)
Base Administration Building (Bexar County, Texas)
Bass Harbor Head Light Station (Hancock County, Maine)
Bathhouse Row (Garland County, Arkansas)
Baton Rouge National Cemetery (East Baton Rouge Parish, Louisiana)
Battery Hasebrouck (Honolulu County, Hawaii)
Battery Hawkins (Honolulu County, Hawaii)
Battery Hawkins Annex (Honolulu County, Hawaii)
Battery Jackson (Honolulu County, Hawaii)
Battery Osgood-Farley (Los Angeles County, California)
Former gun battery that protected the Los Angeles Harbor until World War II.
Battery Randolph (Honolulu County, Hawaii)
Battery Rock (Hardin County, Illinois)
Battery Selfridge (Honolulu County, Hawaii)
Battery Weed (Richmond County, New York)
Battle Creek Post Office (Calhoun County, Michigan)
Battleground National Cemetery (Washington, District of Columbia)
Bay Furnace (Alger County, Michigan)
Bayou Plaquemine Lock (Iberville Parish, Louisiana)
Beacon, The (Barnstable County, Massachusetts)
Bear Creek Road Checking Station (Anderson County, Tennessee)
Bear Island Light Station (Hancock County, Maine)
Bear Lake Comfort Station (Larimer County, Colorado)
Bear Lake Ranger Station (Larimer County, Colorado)
Bear Mountain Lookout Complex (Greenlee County, Arizona)
Beaufort National Cemetery (Beaufort County, South Carolina)
Beaver Creek Bridge (Custer County, South Dakota)
Open-spandrel arch bridge over Beaver Creek on SD 87
Beaver Creek Ranger Station (Yavapai County, Arizona)
Beaver Lake Dam (Hoonah-Angoon Census Area, Alaska)
Beaver Pass Shelter (Whatcom County, Washington)
Beavertail Light (Newport County, Rhode Island)
Beeville Post Office (Bee County, Texas)
Belle Fourche Dam (Butte County, South Dakota)
Bellevue Range Rear Light Station (New Castle County, Delaware)
Bend Skyliners Lodge (Deschutes County, Oregon)
Bennington Post Office (Bennington County, Vermont)
Benville Bridge (Jennings County, Indiana)
Bergland Administrative Site (Ontonagon County, Michigan)
Bering Expedition Landing Site (Valdez-Cordova Census Area, Alaska)
Berlin Post Office (Green Lake County, Wisconsin)
Typical depression era post office, designed by Louis A. Simon under Henry Morgenthau