Built 1868

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Adaland (Barbour County, West Virginia)
Administration Building--Post Hospital (Muskogee County, Oklahoma)
Albert Field Tack Company (Bristol County, Massachusetts)
Alcovy Road Grist Mill (Gwinnett County, Georgia)
Alexander Noble House (Door County, Wisconsin)
Alexander Ramsey House (Ramsey County, Minnesota)
All Saints' Episcopal Cathedral Complex (Milwaukee County, Wisconsin)
Edward Townsend Mix designed complex of cathedral and diocese buildings
Alphonse T. Sengele House (Victoria County, Texas)
American Cemetery (Kodiak Island Borough, Alaska)
Anchorage, The (Jefferson County, Kentucky)
Apostolic Bethlehem Temple Church (Hamilton County, Ohio)
Athens State Hospital (Athens County, Ohio)
Aydelott House (Jefferson County, Kentucky)
Bangor Children's Home (Penobscot County, Maine)
Barrancas National Cemetery (Escambia County, Florida)
Barret House (Henderson County, Kentucky)
Bass Island Brownstone Company Quarry (Ashland County, Wisconsin)
Former quarry, abandoned, part of the Apostle Island National Seashore
Batchelder's Block (Rice County, Minnesota)
Bear Mountain Indian Mission School (Amherst County, Virginia)
Beecher Island Battleground (Yuma County, Colorado)
Belt--Gaskin House (Cayuga County, New York)
Benjamin F. Greene House (Providence County, Rhode Island)
Berkley School (Harford County, Maryland)
Berkshire Life Insurance Company Building (Berkshire County, Massachusetts)
Berlemann House (Madison County, Illinois)
Bethel AME Church (Johnson County, Iowa)
Bethel Church (Franklin County, Missouri)
Beyer Home Museum (Oconto County, Wisconsin)
Blaisdell, Augustus and Laura, House (Windsor County, Vermont)
Bridgeton Bridge (Parke County, Indiana)
Bridgeton Historic District (Parke County, Indiana)
Bristol Industrial Historic District (Bucks County, Pennsylvania)
Brooklyn No. 4 Fire House (Winnebago County, Wisconsin)
Brown-Neas House (Greene County, Tennessee)
Bullitt-Longenecker House (Orleans Parish, Louisiana)
Bushnell Park (Hartford County, Connecticut)
Butler, A.B., House (Cumberland County, Maine)
Byron Howes House (Dakota County, Minnesota)
C. N. James Cabin (Butler County, Kansas)
Calder Houses (Linn County, Iowa)
Cambria Freight Station (Montgomery County, Virginia)
Canyonville Methodist Church (Douglas County, Oregon)
Capt. Amos Birdsall House (Ocean County, New Jersey)
Capt. Archibald S. McKennon House (Johnson County, Arkansas)
Catedral Evangelica Reformada (Essex County, New Jersey)
Cathedral of St. George Historic District (Suffolk County, Massachusetts)
Cedar Island Lighthouse (Suffolk County, New York)
Central Railroad of New Jersey Station (Luzerne County, Pennsylvania)
Central School (Jackson County, Iowa)
Chamberlin Iron Front Building (Union County, Pennsylvania)
Chambers Island Lighthouse (Door County, Wisconsin)
Cherokee Ranch (Douglas County, Colorado)
Childs--Brown House (Providence County, Rhode Island)
Church of the Holy Cross--Episcopal (Rice County, Minnesota)
Church of the Redeemer (Greene County, Georgia)
Historic church in Greensboro, GA
Clayton County Courthouse (Clayton County, Iowa)
Col. J. Hinckley House (Genesee County, Michigan)
College Hall (Washington County, Vermont)
Commandant's Quarters (Muskogee County, Oklahoma)
Conant Thread--Coats & Clark Mill Complex District (Providence County, Rhode Island)
Congregational Church of Iowa City (Johnson County, Iowa)
Cornelius Jensen Ranch (Riverside County, California)
Court Street Methodist Church (Rock County, Wisconsin)
Crossways (Aiken County, South Carolina)
Dale Creek Crossing (48AB145) (Albany County, Wyoming)
Danville National Cemetery (Boyle County, Kentucky)
Darius Sales Munger House (Sedgwick County, Kansas)
Darlington Covered Bridge (Montgomery County, Indiana)
Two-span covered bridge over Sugar Creek on CR 500 North, west of Darlington
Delaware County Courthouse (Delaware County, Ohio)
Donnell, William T., House (Sagadahoc County, Maine)
Douglas, C. F., House (Somerset County, Maine)
Downtown Altoona Historic District (Blair County, Pennsylvania)
Dr. Christian Hockman House (Shenandoah County, Virginia)
Drouillard House (Dickson County, Tennessee)
Duanesburg-Florida Baptist Church (Schenectady County, New York)
Eagle Bluff Lighthouse (Door County, Wisconsin)
East Palmyra Presbyterian Church (Wayne County, New York)
Edmin M. Stanton School (Duval County, Florida)
Elkhart County Courthouse (Elkhart County, Indiana)
Elmwood Place (Union County, Ohio)
Embry Chapel Church (Hardin County, Kentucky)
Fair Meadows (Harford County, Maryland)
Felton Railroad Station (Kent County, Delaware)
First (Park) Congregational Church (Kent County, Michigan)
First Baptist Church (Blue Earth County, Minnesota)
First Evangelical Lutheran Church (Galveston County, Texas)
First Lutheran Church (Mitchell County, Iowa)
First National Bank of Seaford (Sussex County, Delaware)
First Presbyterian Church (Clinton County, New York)
First Presbyterian Church (Fayette County, Illinois)
First United Methodist Church (Fulton County, New York)
Floretta (Manitowoc County, Wisconsin)
Iron Ore Schooner, Foundered off Newton in 1885
Ford House (Monongalia County, West Virginia)
Fort Hill Rural Historic District (Barnstable County, Massachusetts)
Fort Steele (Carbon County, Wyoming)
Fort Supply Historic District (Woodward County, Oklahoma)
Fort Totten (Benson County, North Dakota)
Fort Wingate Historic District (McKinley County, New Mexico)
Founders Hall (Somerset County, Maine)
Fred Vonder Ahe House and Summer Kitchen (Clackamas County, Oregon)
Fredendall Block (Rock County, Wisconsin)
Gambrill House (Frederick County, Maryland)
George and Nancy Turner House (Dodge County, Nebraska)
George March House (Erie County, Ohio)
George W. Whitney House (Cuyahoga County, Ohio)
German Methodist Episcopal Church (Des Moines County, Iowa)
Gilmore-Patterson Farm (Bladen County, North Carolina)
Glenmore (Jefferson County, Tennessee)
Glyndon Historic District (Baltimore County, Maryland)
Golden Spike National Historic Site (Box Elder County, Utah)
The completion of the transcontinental railroad.
Goodbread--Black Farm Historic District (Columbia County, Florida)
Gordon Hitt Farmstead (Jackson County, Michigan)
Gov. Edward Scofield House (Oconto County, Wisconsin)
Gov. Joseph Sayers House (Bastrop County, Texas)
Grace Episcopal Church (Middlesex County, Massachusetts)
Grace United Methodist Church (New Castle County, Delaware)
Grand Hotel (New York County, New York)
Granite Island Light Station (Marquette County, Michigan)
Great Captain Island Lighthouse (Fairfield County, Connecticut)
Greely Institute (Cumberland County, Maine)
Gudgeonville Covered Bridge (Erie County, Pennsylvania)
Covered bridge over Elk Creek on Gudgeonville Road (TR 400)
H.N. Jennings House (Genesee County, Michigan)
Hammond Organ Factory (Worcester County, Massachusetts)
Heck--Hasler House (Johnson County, Indiana)
Henry Ambler House (Henry County, Iowa)
Henry Beins House (Franklin County, Missouri)
Henry Jones Farmstead (Pettis County, Missouri)
Henry T. Rainey Farm (Greene County, Illinois)
Hood College Historic District (Frederick County, Maryland)
Hopkins' Covered Bridge Farm (Sussex County, Delaware)
House at 1249--1251 Scott Street (San Francisco County, California)
Hoyt, Benjamin, House (Middlesex County, Massachusetts)
Huron Islands Lighthouse (Marquette County, Michigan)
Illinois State Capitol (Sangamon County, Illinois)
Inskip Hotel (Butte County, California)
Ipswich Mills Historic District (Essex County, Massachusetts)
Ivory McKusick House (Washington County, Minnesota)
J. K. Gill Building (Marion County, Oregon)
Jaffrey Mills (Cheshire County, New Hampshire)
James B. Wakefield House (Faribault County, Minnesota)
James Tompkins House (Outagamie County, Wisconsin)
Jens Hansen Wagon and Carriage Shop (Waupaca County, Wisconsin)
Former wagon works repurposed for modern use
Jesse Chisholm Grave Site (Blaine County, Oklahoma)
Johannes Erickson House (Washington County, Minnesota)
John and Wilhelmina Helm House (Franklin County, Missouri)
John Deis House (Tuscarawas County, Ohio)
John Gill Farmstead (Fairfield County, Ohio)
John Gottlieb Pfeiffer House (Rice County, Minnesota)
John H. Broeker House (Franklin County, Missouri)
John N. Ingersoll House (Shiawassee County, Michigan)
John Raine House (Hardin County, Kentucky)
John W. Bennett House (Nemaha County, Nebraska)
John W. Jones House (Chemung County, New York)
Jonas J. Pierce House (Mercer County, Pennsylvania)
Jonesville Academy (Chittenden County, Vermont)
Joseph P. Mentzer House (Linn County, Iowa)
Joseph Ross House (Sangamon County, Illinois)
Judge Cyrus Ball House (Tippecanoe County, Indiana)
Kaese Mill (Garrett County, Maryland)
Keddel and Liv Grimland Farm (Bosque County, Texas)
Kennedy Park (Bristol County, Massachusetts)
Kidd's Mills Covered Bridge Historic District (Mercer County, Pennsylvania)
Covered bridge over Shenango River on Kidds Mill Road (TR 471)
Kings County Savings Bank (Kings County, New York)
Kinnickinnic Church (St. Croix County, Wisconsin)
Kirch/Latch Building (Winona County, Minnesota)
Knuessl Building (LaSalle County, Illinois)
Kucheman Building (Jackson County, Iowa)
Lampson School (Addison County, Vermont)
Lancaster District School No. 6 (Erie County, New York)
Lars Rudi House (Renville County, Minnesota)
Laughery Creek Bridge (Dearborn County, Indiana)
Triple Intersection Whipple through truss bridge over Laughery Creek on Old IN 56
Lemuel II Kimball House (Lake County, Ohio)
Levi D. Jarrard House (Middlesex County, New Jersey)
Lexington National Cemetery (Fayette County, Kentucky)
Lincoln Park Zoo (Cook County, Illinois)
Public zoo.
Linden (Calvert County, Maryland)
Little Rock National Cemetery (Pulaski County, Arkansas)
Lock Ridge Furnance Complex (Lehigh County, Pennsylvania)
Partially restored ruins of the Lock Ridge furnaces, now a park and museum.
Locust Creek Covered Bridge (Linn County, Missouri)
Covered bridge over the old channel of Locust Creek between Laclede and Meadville off US 36
Lofthus (shipwreck) (Palm Beach County, Florida)
LONESTAR (Scott County, Iowa)
Louisa County Courthouse (Louisa County, Virginia)
Lovejoy Bridge (Oxford County, Maine)
Covered bridge over Ellis River on Covered Bridge Road
Lucius Blake House (Racine County, Wisconsin)
Tuscan villa with a hipped-roof tower and bracketed eaves
Luther College Farm (Winneshiek County, Iowa)