Built 1851

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Adam Pence House (Lincoln County, Kentucky)
Alabama Girls' Industrial School (Shelby County, Alabama)
A women-only technical school that also offered high school-level courses.
Alfred Buffat Homestead (Knox County, Tennessee)
Allegheny Tunnel (Cambria County, Pennsylvania)
Middle bore of three through Tunnel Hill, Gallitzin PA
Alois Herbert Double House (Buchanan County, Missouri)
Alumni Hall (Allegany County, New York)
Andrews, Joseph, House (Middlesex County, Massachusetts)
Arnoldus Brumby House (Cobb County, Georgia)
Auburn Players Theater (Lee County, Alabama)
The oldest building in its original location on the campus of Auburn University in Auburn, Alabama.
Avirett-Stephens Plantation (Onslow County, North Carolina)
Barber-Barbour House (Jefferson County, Kentucky)
Bascom Hill Historic District (Dane County, Wisconsin)
The original campus of the University of Wisconsin, centered on Bascom Hall
Bassett, C.J.H., House (Bristol County, Massachusetts)
Beaver Island Light Station (Charlevoix County, Michigan)
Bell-Varner House (Washington County, Maryland)
Belli Building (San Francisco County, California)
Ben Johnson House (Nelson County, Kentucky)
Beth Olam Cemetery (Kings County, New York)
Bledsoe County Jail (Bledsoe County, Tennessee)
Bloomington Viaduct (Garrett County, Maryland)
A 3 span arch railroad bridge over the North Branch of the Potomac river.
Botherum (Fayette County, Kentucky)
Boutwell, Gov. George S., House (Middlesex County, Massachusetts)
Brooklyn Borough Hall (Kings County, New York)
Bryn Mawr (Licking County, Ohio)
C. Burton Hotel (Sullivan County, New York)
Capt. John C. Ainsworth House (Clackamas County, Oregon)
Carthage Historic District (Moore County, North Carolina)
Central Avenue Historic District (Oldham County, Kentucky)
Charles Trombly House (Wayne County, Michigan)
Chateau-sur-Mer (Newport County, Rhode Island)
Chesterville Methodist Church (Morrow County, Ohio)
Church of St. John in the Wilderness (Columbia County, New York)
Church of the Advent (Spartanburg County, South Carolina)
Historic church in Spartanburg, SC
Cloud Home (Schuylkill County, Pennsylvania)
Coburn Covered Bridge (Washington County, Vermont)
Covered bridge over Winooski River on Coburn Road (C3030)
Cohen House (Petersburg, Virginia)
Colorado House (San Diego County, California)
Coolidge Stores Building (Madison County, New York)
Cotting, John, House (Middlesex County, Massachusetts)
Crawford, Elias, House (Worcester County, Massachusetts)
Daughters' College (Mercer County, Kentucky)
David Carpenter House (Lenawee County, Michigan)
David Littell House (Beaver County, Pennsylvania)
Dawley House (Scott County, Iowa)
Deer Park Hotel (New Castle County, Delaware)
Dickey--Birdsong Plantation (Grady County, Georgia)
Dinwiddie County Courthouse (Dinwiddie County, Virginia)
Doub Farm (Washington County, Maryland)
Downing, Lewis, Jr., House (Merrimack County, New Hampshire)
Dr. John Babcock House (Albany County, New York)
Dr. John Milton Perkins House (Pulaski County, Kentucky)
Dr. Robert Battey House (Floyd County, Georgia)
East Bridgeport Historic District (Fairfield County, Connecticut)
Edmund Gleason House (Cuyahoga County, Ohio)
Elmwood (Washington County, Kentucky)
Farmers Institute (Tippecanoe County, Indiana)
Fire Station No. 5 (Mobile County, Alabama)
First Baptist Church of Grand Blanc (Genesee County, Michigan)
First Cherokee Female Seminary Site (Cherokee County, Oklahoma)
First Presbyterian Church (Racine County, Wisconsin)
First Presbyterian Church (Greene County, Alabama)
A historic Greek Revival church building in Eutaw, Alabama.
Flemington Presbyterian Church (Liberty County, Georgia)
Fort Belknap (Young County, Texas)
Fort Jones House (Siskiyou County, California)
Fort Phantom Hill (Jones County, Texas)
Fort Union National Monument (Mora County, New Mexico)
Gardner House (Albemarle County, Virginia)
Gen. Benjamin Henry Grierson House (Morgan County, Illinois)
Gibbs House (Carteret County, North Carolina)
Gilead Railroad Station, Former (Androscoggin County, Maine)
Moved in Jan 2011 from Auburn back to Gilead, Oxford County
Gilead Railroad Station, Former (Oxford County, Maine)
Glencoe (Baltimore County, Maryland)
Glenelg Manor (Howard County, Maryland)
Glenwood (Yadkin County, North Carolina)
Grace Episcopal Church (Essex County, Massachusetts)
Gray-Watkins Mill (Kane County, Illinois)
Greene-Marston House (Mobile County, Alabama)
Grider House (Warren County, Kentucky)
Guadalupe Hotel (Comal County, Texas)
Hammond Heights (Worcester County, Massachusetts)
Harrison County Courthouse (Harrison County, Kentucky)
Hiram Douglas House (Hamilton County, Tennessee)
Hiram Palmer House (Fulton County, Illinois)
Horace Loomis House (Walworth County, Wisconsin)
Howard's Gristmill (Clackamas County, Oregon)
Hunnewell Estates Historic District (Norfolk County, Massachusetts)
Ingleside (Washington, District of Columbia)
Inn at Fowlerstown (Brooke County, West Virginia)
J. C. M. Merrillat House (Staunton, Virginia)
Jacob Gayer House (Medina County, Ohio)
Janssen Park (Polk County, Arkansas)
Jefferson Schoolhouse (Hamilton County, Ohio)
Jenny Lind Chapel (Henry County, Illinois)
Jeremiah II or Edward Risley House (Atlantic County, New Jersey)
John McCauley House (Fayette County, Kentucky)
Joseph Knoble Brewery (Sebastian County, Arkansas)
Judge Alexander H. Phillips House (Victoria County, Texas)
Junction Shop and Herman Street District (Worcester County, Massachusetts)
Justin Breckenridge House (Lorain County, Ohio)
Keeney House (Genesee County, New York)
Kensington Plantation House (Richland County, South Carolina)
Kent Industrial District (Portage County, Ohio)
Kincaid-Ausmus House (Claiborne County, Tennessee)
Lafayette Square Historic District (Washington, District of Columbia)
Lick Log Mill Store (Macon County, North Carolina)
Linden Methodist Church (Iowa County, Wisconsin)
Loudoun House (Fayette County, Kentucky)
Lovell Village Church (Oxford County, Maine)
M. S. Whitcomb Farm (Chittenden County, Vermont)
MacDonald Farm (Delaware County, New York)
Mansion House (Highland County, Virginia)
Marble Collegiate Reformed Church (New York County, New York)
Marshallville Commercial District (Macon County, Georgia)
Martin Cheairs House (Maury County, Tennessee)
Martin Wenger Farmhouse (St. Joseph County, Indiana)
Masonic Hall, Old (Winston County, Mississippi)
McFadin House (Williamson County, Texas)
McLaughlin House and Garden (Oxford County, Maine)
Meeks--Green Farmstead (Iron County, Utah)
Merritt, Captain Isaac, House (Sagadahoc County, Maine)
Mill Agent's House (Kennebec County, Maine)
Monroe Park Historic District (Richmond, Virginia)
Monteith Historic District (Linn County, Oregon)
Montezuma Historic District (Macon County, Georgia)
Montvale (Worcester County, Massachusetts)
Monument Mills (Berkshire County, Massachusetts)
Moravian Church (Brown County, Wisconsin)
Built in 1851, moved to Heritage Hill State Park in 1980
Moses Fowler House (Tippecanoe County, Indiana)
Mount Holyoke Summit House (Hampshire County, Massachusetts)
The Mount Holyoke "Prospect House" was a popular tourist destination in Hadley
Mount Saint Bernard Seminary and Barn (Dubuque County, Iowa)
Most assuredly closed to the public
Mt. Zion Presbyterian Church (Lee County, South Carolina)
Mull Covered Bridge (Sandusky County, Ohio)
Covered bridge on CR 9 southwest of Fremont
Nathaniel Prothro Plantation (Stewart County, Georgia)
Nell, William C., House (Suffolk County, Massachusetts)
New Market Township Community House (Highland County, Ohio)
Newton M. Pitt House (Oswego County, New York)
North Aberdeen Historic District (Monroe County, Mississippi)
North Hall, University of Wisconsin (Dane County, Wisconsin)
UW's first building, now also part of the Bascom Hill Historic District
North Main Street Historic District (Alamance County, North Carolina)
Numertia Plantation (Orangeburg County, South Carolina)
Ocean County Jail (Ocean County, New Jersey)
Old Dominion Bank Building (Alexandria, Virginia)
Old Fort Bliss (El Paso County, Texas)
Old Kaw Mission (Morris County, Kansas)
Old Lynn High School (Essex County, Massachusetts)
Old Mill House (Scott County, Iowa)
Old Newburgh Presbyterian Church (Warrick County, Indiana)
Old St. Paul's Methodist Episcopal Church (New Castle County, Delaware)
Old Stone Hotel (Jo Daviess County, Illinois)
Oran Community Church (Onondaga County, New York)
Orange Grove (Sumter County, South Carolina)
Painesville Chapel (Milwaukee County, Wisconsin)
Built of hand-hewn timbers, this chapel was built in 1851 and preserved in the 1930s
Painter-Bernatz Mill (Winneshiek County, Iowa)
Parker, Stillman, House (Middlesex County, Massachusetts)
Pectol-Works House (Sanpete County, Utah)
Penn Place (Chattooga County, Georgia)
Pennsylvania State Lunatic Hospital (Dauphin County, Pennsylvania)
Perry Hill (Buckingham County, Virginia)
Phillips--Ronald House (Montgomery County, Virginia)
Pinckney R. Tully House (Santa Fe County, New Mexico)
Pioneer Cemetery (Calaveras County, California)
Plaza de San Luis de la Culebra (Costilla County, Colorado)
Pleasant Hill Presbyterian Church (Dallas County, Alabama)
A historic Greek Revival church in Pleasant Hill, Alabama.
Potter County Courthouse (Potter County, Pennsylvania)
Prospect (Mercer County, New Jersey)
Prospect Congregational Church (Middlesex County, Massachusetts)
Prudence Island Lighthouse (Newport County, Rhode Island)
Rawlings--Brownell House (Fayette County, Ohio)
Richardson-Jakway House (Buchanan County, Iowa)
Ridgebury Congregational Church (Fairfield County, Connecticut)
Ripon College Historic District (Fond du Lac County, Wisconsin)
Campus of Ripon College, Alma Mater of Spencer Tracy and Harrison Ford
Riverton Historic District (Burlington County, New Jersey)
Robert G. Campbell House (St. Louis, Missouri)
Rockport Cemetery (Hot Spring County, Arkansas)
Rockwood (New Castle County, Delaware)
Russell--Lackey--Prater House (Blount County, Tennessee)
Saint Paul's Church, Chapel, and Parish House (Norfolk County, Massachusetts)
Saint Thomas Episcopal Church and Rectory (Providence County, Rhode Island)
Salem Presbyterian Church (Salem, Virginia)
Schlichtig House (St. Louis, Missouri)
Semple House (Montgomery County, Alabama)
Shepard Block (Essex County, Massachusetts)
Simeon Lewis Rural Historic District (Jefferson County, Kentucky)
Smith House (Tuscola County, Michigan)
Smith, Perez, House (Middlesex County, Massachusetts)
South Camden Historic District (Camden County, New Jersey)
South Congregational Church (Kings County, New York)
Spring City Historic District (Sanpete County, Utah)
St. John Chrysostom Church (Waukesha County, Wisconsin)
A lovely wooden board and batten church, set back from the roadway.
St. John's Episcopal Church (Multnomah County, Oregon)
St. Joseph's Roman Catholic Church (Providence County, Rhode Island)
Photo shows wrong building, see street view
St. Luke's Church (Baltimore, Maryland)
St. Mary's Church (Harford County, Maryland)
St. Mary's Of Morges (Carroll County, Ohio)