[ 8] Landmark name   Image   Date designated[ 9]   Location   County   Description        1  Adena Adena February 27, 2003 (#70000515 ) Chillicothe 39°21′13″N  83°00′55″W  /  39.353613°N 83.015345°W  / 39.353613; -83.015345   (Adena )  Ross    Mansion of Thomas Worthington      2  Baum-Taft House Baum-Taft House January 7, 1976 (#73001470 ) Cincinnati 39°06′09″N  84°30′12″W  /  39.1025°N 84.503333°W  / 39.1025; -84.503333   (Baum-Taft House )  Hamilton    Taft family home now an art museum; designated for landscape murals by African-American artist Robert S. Duncanson .     3  Beginning Point of the U.S. Public Land Survey Beginning Point of the U.S. Public Land Survey June 23, 1965 (#66000606 ) East Liverpool, OH  and Ohioville, PA 40°38′26″N  80°31′10″W  /  40.640487°N 80.519377°W  / 40.640487; -80.519377   (Beginning Point of the U.S. Public Land Survey )  Columbiana, OH  and Beaver, PA    Marker of origin of Northwest Territories survey, on Pennsylvania border     4  Carew Tower-Netherland Plaza Hotel Carew Tower-Netherland Plaza Hotel April 19, 1994 (#82003578 ) Cincinnati 39°05′56″N  84°31′31″W  /  39.099012°N 84.525224°W  / 39.099012; -84.525224   (Carew Tower-Netherland Plaza Hotel )  Hamilton         5  Central Branch, National Home for Disabled Volunteer Soldiers Central Branch, National Home for Disabled Volunteer Soldiers October 16, 2012 (#03001412 ) Dayton 39°44′33″N  84°15′52″W  /  39.742368°N 84.26458°W  / 39.742368; -84.26458   (Central Branch, National Home for Disabled Volunteer Soldiers )  Montgomery         6  Cincinnati Music Hall Cincinnati Music Hall December 2, 1974 (#70000496 ) Cincinnati 39°06′32″N  84°31′06″W  /  39.108928°N 84.518286°W  / 39.108928; -84.518286   (Cincinnati Music Hall )  Hamilton         7  Cincinnati Observatory Cincinnati Observatory December 9, 1997 (#80003043 ) Cincinnati 39°08′27″N  84°25′22″W  /  39.140935°N 84.422699°W  / 39.140935; -84.422699   (Cincinnati Observatory )  Hamilton         8  Cincinnati Union Terminal Cincinnati Union Terminal May 5, 1977 (#72001018 ) Cincinnati 39°06′35″N  84°31′56″W  /  39.109778°N 84.532190°W  / 39.109778; -84.532190   (Cincinnati Union Terminal )  Hamilton         9  Cincinnati Zoo Historic Structures Cincinnati Zoo Historic Structures February 27, 1987 (#87000905 ) Cincinnati 39°08′33″N  84°30′34″W  /  39.142493°N 84.509395°W  / 39.142493; -84.509395   (Cincinnati Zoo Historic Structures )  Hamilton         10  Cleveland Arcade Cleveland Arcade May 15, 1975 (#73001408 ) Cleveland 41°29′59″N  81°41′27″W  /  41.499702°N 81.690794°W  / 41.499702; -81.690794   (Cleveland Arcade )  Cuyahoga         11  USS Cod  (Submarine) USS Cod  (Submarine) January 14, 1986 (#86000088 ) Cleveland 41°30′30″N  81°41′32″W  /  41.508328°N 81.692132°W  / 41.508328; -81.692132   (USS Cod  (Submarine) )  Cuyahoga    The USS Cod Submarine Memorial is a National Historic Landmark  and is docked in Cleveland, Ohio .     12  Jay Cooke Home Jay Cooke Home November 13, 1966 (#66000620 ) Gibraltar Island 41°39′29″N  82°49′16″W  /  41.658056°N 82.821111°W  / 41.658056; -82.821111   (Jay Cooke Home )  Ottawa    Summer home of financier Jay Cooke      13  Covington And Cincinnati Suspension Bridge Covington And Cincinnati Suspension Bridge May 15, 1975 (#75000786 ) Cincinnati, OH  and Covington, KY 39°05′25″N  84°30′34″W  /  39.09039°N 84.509571°W  / 39.09039; -84.509571   (Covington And Cincinnati Suspension Bridge )  Hamilton, OH  and Kenton, KY    John A. Roebling 's suspension bridge here was dramatic new design. It set precedent for Brooklyn Bridge  later.    14  Manasseh Cutler Hall, Ohio University Manasseh Cutler Hall, Ohio University December 21, 1965 (#66000604 ) Athens 39°19′27″N  82°06′02″W  /  39.324184°N 82.100512°W  / 39.324184; -82.100512   (Manasseh Cutler Hall, Ohio University )  Athens         15  Donald B.  (Towboat)Donald B.  (Towboat)December 20, 1989 (#89002458 ) Bellaire 40°01′16″N  80°44′17″W  /  40.02111°N 80.73805°W  / 40.02111; -80.73805   (Donald B.  (Towboat)  Belmont    The Donald B.  was built in 1923 and is the only 1920s unchanged diesel sternwheel  towboat  left in the United States. It still operates towing barges in the Ohio River.[ 10] Switzerland County, Indiana , its home port was moved to Bellaire, Ohio in 2012.[ 11]     16  Paul Laurence Dunbar House Paul Laurence Dunbar House December 29, 1962 (#66000619 ) Dayton 39°45′27″N  84°13′07″W  /  39.757366°N 84.218681°W  / 39.757366; -84.218681   (Paul Laurence Dunbar House )  Montgomery    Home of black poet Paul Laurence Dunbar      17  Thomas A. Edison Birthplace Thomas A. Edison Birthplace January 12, 1965 (#66000608 ) Milan 41°18′00″N  82°36′16″W  /  41.300066°N 82.604437°W  / 41.300066; -82.604437   (Thomas A. Edison Birthplace )  Erie         18  Eldean Covered Bridge Eldean Covered Bridge December 23, 2016 (#100000868 ) Troy 40°04′40″N  84°13′00″W  /  40.077902°N 84.216666°W  / 40.077902; -84.216666   (Eldean Covered Bridge )  Miami    Only one of twelve long truss bridges  still intact. It is considered to be the most structurely intact.[ 12]     19  Wilson Bruce Evans House Wilson Bruce Evans House December 9, 1997 (#80003143 ) Oberlin 41°17′20″N  82°12′59″W  /  41.288888°N 82.216321°W  / 41.288888; -82.216321   (Wilson Bruce Evans House )  Lorain         20  Fallen Timbers Battlefield Fallen Timbers Battlefield October 9, 1960 (#66000616 ) Maumee 41°32′32″N  83°41′51″W  /  41.542262°N 83.697445°W  / 41.542262; -83.697445   (Fallen Timbers Battlefield )  Lucas         21  Fort Ancient Fort Ancient July 19, 1964 (#66000625 ) Lebanon 39°24′29″N  84°05′28″W  /  39.40806°N 84.0911°W  / 39.40806; -84.0911   (Fort Ancient )  Warren         22  Fort Meigs Fort Meigs August 4, 1969 (#69000151 ) Perrysburg 41°33′03″N  83°39′05″W  /  41.550806°N 83.651523°W  / 41.550806; -83.651523   (Fort Meigs )  Wood         23  James A. Garfield Home James A. Garfield Home January 28, 1964 (#66000613 ) Mentor 41°39′49″N  81°21′04″W  /  41.663616°N 81.351052°W  / 41.663616; -81.351052   (James A. Garfield Home )  Lake         24  Joshua R. Giddings Law Office Joshua R. Giddings Law Office May 30, 1974 (#74001396 ) Jefferson 41°44′18″N  80°45′47″W  /  41.738351°N 80.763127°W  / 41.738351; -80.763127   (Joshua R. Giddings Law Office )  Ashtabula         25  Glendale Historic District Glendale Historic District May 5, 1977 (#76001447 ) Glendale 39°16′18″N  84°27′49″W  /  39.271634°N 84.46362°W  / 39.271634; -84.46362   (Glendale Historic District )  Hamilton         26  U.S. Grant Boyhood Home U.S. Grant Boyhood Home February 4, 1985 (#76001374 ) Georgetown 38°51′57″N  83°54′08″W  /  38.865814°N 83.902148°W  / 38.865814; -83.902148   (U.S. Grant Boyhood Home )  Brown         27  Greenhills Historic District Greenhills Historic District December 23, 2016 (#100000800 ) Greenhills 39°15′50″N  84°31′28″W  /  39.263889°N 84.524444°W  / 39.263889; -84.524444   (Greenhills Historic District )  Hamilton         28  Warren G. Harding Home Warren G. Harding Home June 23, 1965 (#66000618 ) Marion 40°35′11″N  83°07′18″W  /  40.586279°N 83.121691°W  / 40.586279; -83.121691   (Warren G. Harding Home )  Marion         29  Hawthorn Hill Hawthorn Hill July 17, 1991 (#74001585 ) Oakwood 39°43′13″N  84°10′34″W  /  39.720416°N 84.176224°W  / 39.720416; -84.176224   (Hawthorn Hill )  Montgomery    The Orville Wright mansion.     30  Hopeton Earthworks Hopeton Earthworks July 19, 1964 (#66000623 ) Hopetown 39°22′47″N  82°59′08″W  /  39.379604°N 82.985474°W  / 39.379604; -82.985474   (Hopeton Earthworks )  Ross         31  Huffman Prairie Flying Field Huffman Prairie Flying Field June 21, 1990 (#71000640 ) Fairborn 39°48′12″N  84°03′57″W  /  39.803333°N 84.065833°W  / 39.803333; -84.065833   (Huffman Prairie Flying Field )  Greene         32  Johnson's Island Civil War Prison Johnson's Island Civil War Prison June 21, 1990 (#75001514 ) Danbury 41°29′42″N  82°44′12″W  /  41.494998°N 82.73675°W  / 41.494998; -82.73675   (Johnson's Island Civil War Prison )  Ottawa         33  Charles F. Kettering House Charles F. Kettering House December 22, 1977 (#77001080 ) Kettering 39°41′33″N  84°11′34″W  /  39.692590°N 84.192796°W  / 39.692590; -84.192796   (Charles F. Kettering House )  Montgomery         34  Kirtland Temple Kirtland Temple December 8, 1976 (#69000145 ) Kirtland 41°37′33″N  81°21′44″W  /  41.625958°N 81.362149°W  / 41.625958; -81.362149   (Kirtland Temple )  Lake         35  John Mercer Langston House John Mercer Langston House May 15, 1975 (#75001464 ) Oberlin 41°17′30″N  82°12′31″W  /  41.291556°N 82.208590°W  / 41.291556; -82.208590   (John Mercer Langston House )  Lorain         36  Langstroth Cottage Langstroth Cottage December 21, 1981 (#76001378 ) Oxford 39°30′17″N  84°43′49″W  /  39.504648°N 84.730223°W  / 39.504648; -84.730223   (Langstroth Cottage )  Butler         37  Edward D. Libbey House Edward D. Libbey House May 4, 1983 (#83004379 ) Toledo 41°39′38″N  83°33′32″W  /  41.660549°N 83.559008°W  / 41.660549; -83.559008   (Edward D. Libbey House )  Lucas         38  Benjamin Lundy House Benjamin Lundy House May 30, 1974 (#74001537 ) Mt. Pleasant 40°10′29″N  80°48′13″W  /  40.17483°N 80.80354°W  / 40.17483; -80.80354   (Benjamin Lundy House )  Jefferson         39  MAJESTIC  (Showboat)MAJESTIC  (Showboat)December 20, 1989 (#80003085 ) Cincinnati 39°05′42″N  84°30′17″W  /  39.09497°N 84.50467°W  / 39.09497; -84.50467   (MAJESTIC  (Showboat)  Hamilton         40  May 4, 1970, Kent State Shootings Site May 4, 1970, Kent State Shootings Site December 23, 2016 (#100000879 ) Kent 41°09′00″N  81°20′36″W  /  41.1501°N 81.3433°W  / 41.1501; -81.3433   (May 4, 1970, Kent State Shootings Site )  Portage    Site of May 4, 1970, shootings of Vietnam War protesters  by Ohio National Guardsmen  that killed four.     41  William H. McGuffey Boyhood Home Site William H. McGuffey Boyhood Home Site May 23, 1966 (#66000617 ) Coitsville Township 41°06′57″N  80°33′31″W  /  41.115833°N 80.558611°W  / 41.115833; -80.558611   (William H. McGuffey Boyhood Home Site )  Mahoning         42  William H. McGuffey House William H. McGuffey House December 21, 1965 (#66000605 ) Oxford 39°30′26″N  84°44′10″W  /  39.507230°N 84.736078°W  / 39.507230; -84.736078   (William H. McGuffey House )  Butler         43  William McKinley Tomb William McKinley Tomb May 15, 1975 (#70000516 ) Canton 40°48′24″N  81°23′33″W  /  40.806667°N 81.3925°W  / 40.806667; -81.3925   (William McKinley Tomb )  Stark         44  Miami and Erie Canal Deep Cut Miami and Erie Canal Deep Cut January 29, 1964 (#66000603 ) Spencerville 40°41′15″N  84°21′55″W  /  40.6875°N 84.365278°W  / 40.6875; -84.365278   (Miami and Erie Canal Deep Cut )  Allen  and Auglaize    Mile long segment of the Miami and Erie Canal  cut as deep as 52 feet (16 m), in order to cut a trough through a blue clay ridge separating the St. Marys  and Auglaize River  watersheds     45  Mount Pleasant Historic District Mount Pleasant Historic District April 5, 2005 (#74001536 ) Mt. Pleasant 40°10′28″N  80°47′55″W  /  40.174444°N 80.798611°W  / 40.174444; -80.798611   (Mount Pleasant Historic District )  Jefferson         46  Newark Earthworks Newark Earthworks July 19, 1964 (#66000614 ) Heath  and Newark 40°02′32″N  82°25′48″W  /  40.042167°N 82.430111°W  / 40.042167; -82.430111   (Newark Earthworks )  Licking         47  Oberlin College Oberlin College December 21, 1965 (#66000615 ) Oberlin 41°17′35″N  82°13′07″W  /  41.292929°N 82.218576°W  / 41.292929; -82.218576   (Oberlin College )  Lorain         48  Ohio and Erie Canal Ohio and Erie Canal November 13, 1966 (#66000607 ) Valley View 41°22′14″N  81°36′59″W  /  41.370525°N 81.616442°W  / 41.370525; -81.616442   (Ohio and Erie Canal )  Cuyahoga    A four mile (6 km) section of canal, including Tinkers Creek Aqueduct      49  Ohio Statehouse Ohio Statehouse December 22, 1977 (#72001011 ) Columbus 39°57′41″N  82°59′56″W  /  39.961389°N 82.998889°W  / 39.961389; -82.998889   (Ohio Statehouse )  Franklin         50  Ohio Theatre Ohio Theatre May 5, 1977 (#73001437 ) Columbus 39°57′37″N  82°59′57″W  /  39.960281°N 82.999078°W  / 39.960281; -82.999078   (Ohio Theatre )  Franklin         51  John P. Parker House John P. Parker House February 18, 1997 (#97000340 ) Ripley 38°44′56″N  83°50′56″W  /  38.748852°N 83.848872°W  / 38.748852; -83.848872   (John P. Parker House )  Brown         52  George Hunt Pendleton House George Hunt Pendleton House January 29, 1964 (#66000611 ) Cincinnati 39°06′36″N  84°30′16″W  /  39.110102°N 84.504483°W  / 39.110102; -84.504483   (George Hunt Pendleton House )  Hamilton         53  Pennsylvania Railroad Depot and Baggage Room Pennsylvania Railroad Depot and Baggage Room June 17, 2011 (#76001536 ) Dennison 40°23′32″N  81°19′56″W  /  40.392155°N 81.332178°W  / 40.392155; -81.332178   (Pennsylvania Railroad Depot and Baggage Room )  Tuscarawas         54  People's Federal Savings and Loan Association People's Federal Savings and Loan Association December 22, 1977 (#72001042 ) Sidney 40°17′04″N  84°09′23″W  /  40.284410°N 84.156437°W  / 40.284410; -84.156437   (People's Federal Savings and Loan Association )  Shelby    Louis Sullivan -designed bank building    55  Plum Street Temple Plum Street Temple May 15, 1975 (#72001021 ) Cincinnati 39°06′14″N  84°31′07″W  /  39.103937°N 84.518678°W  / 39.103937; -84.518678   (Plum Street Temple )  Hamilton         56  John Rankin House John Rankin House February 18, 1997 (#70000485 ) Ripley 38°45′04″N  83°50′32″W  /  38.751111°N 83.842222°W  / 38.751111; -83.842222   (John Rankin House )  Brown    Home of John Rankin , abolitionist.     57  Captain Edward V. Rickenbacker House Captain Edward V. Rickenbacker House May 11, 1976 (#76001426 ) Columbus 39°56′58″N  82°57′44″W  /  39.949339°N 82.962179°W  / 39.949339; -82.962179   (Captain Edward V. Rickenbacker House )  Franklin         58  S. Bridge, National Road S. Bridge, National Road January 29, 1964 (#66000610 ) Old Washington 40°02′36″N  81°22′27″W  /  40.043298°N 81.374300°W  / 40.043298; -81.374300   (S. Bridge, National Road )  Guernsey         59  Serpent Mound Serpent Mound July 19, 1964 (#66000602 ) Locust Grove 39°01′00″N  83°26′00″W  /  39.0166666°N 83.433334°W  / 39.0166666; -83.433334   (Serpent Mound )  Adams         60  Sherman Birthplace Sherman Birthplace January 29, 1964 (#66000609 ) Lancaster 39°42′49″N  82°36′04″W  /  39.713722°N 82.600988°W  / 39.713722; -82.600988   (Sherman Birthplace )  Fairfield         61  Dr. Bob's Home (Dr. Robert and Anne Smith House) Dr. Bob's Home (Dr. Robert and Anne Smith House) October 16, 2012 (#85003411 ) Akron 41°05′45″N  81°32′57″W  /  41.095797°N 81.549234°W  / 41.095797; -81.549234   (Dr. Bob's Home (Dr. Robert and Anne Smith House) )  Summit    Birthplace of Alcoholics Anonymous ,[ 13] Bob Smith (doctor)      62  Spacecraft Propulsion Research Facility (B-2) Spacecraft Propulsion Research Facility (B-2) October 3, 1985 (#85002802 ) Sandusky 41°21′55″N  82°41′01″W  /  41.365141°N 82.6837°W  / 41.365141; -82.6837   (Spacecraft Propulsion Research Facility (B-2) )  Erie    the world's only facility capable of testing full-scale upper-stage launch vehicles and rocket engines under simulated high-altitude conditions.     63  Spiegel Grove (Rutherford B. Hayes Home) Spiegel Grove (Rutherford B. Hayes Home) January 29, 1964 (#66000624 ) Fremont 41°20′31″N  83°07′35″W  /  41.342037°N 83.126354°W  / 41.342037; -83.126354   (Spiegel Grove (Rutherford B. Hayes Home) )  Sandusky    Estate of U.S. president Rutherford B. Hayes , now a state park     64  Spring Grove Cemetery Spring Grove Cemetery March 29, 2007 (#76001440 ) Cincinnati 39°09′53″N  84°31′23″W  /  39.164661°N 84.522949°W  / 39.164661; -84.522949   (Spring Grove Cemetery )  Hamilton         65  Stan Hywet Hall Stan Hywet Hall December 21, 1981 (#75002058 ) Akron 41°07′02″N  81°32′55″W  /  41.117104°N 81.548583°W  / 41.117104; -81.548583   (Stan Hywet Hall )  Summit         66  Sunwatch Site Sunwatch Site June 21, 1990 (#75001500 ) Dayton 39°42′48″N  84°13′55″W  /  39.71321°N 84.231861°W  / 39.71321; -84.231861   (Sunwatch Site )  Montgomery         67  Alphonso Taft Home (William Howard Taft Home) Alphonso Taft Home (William Howard Taft Home) January 29, 1964 (#66000612 ) Cincinnati 39°06′03″N  84°30′12″W  /  39.100707°N 84.503311°W  / 39.100707; -84.503311   (Alphonso Taft Home (William Howard Taft Home) )  Hamilton    Birthplace and home until age 25 of U.S. President William Howard Taft      68  John B. Tytus House John B. Tytus House May 11, 1976 (#75001335 ) Middletown 39°30′47″N  84°24′30″W  /  39.513148°N 84.408301°W  / 39.513148; -84.408301   (John B. Tytus House )  Butler         69  Harriet Taylor Upton House Harriet Taylor Upton House October 5, 1992 (#92001884 ) Warren 41°14′22″N  80°49′21″W  /  41.239442°N 80.822558°W  / 41.239442; -80.822558   (Harriet Taylor Upton House )  Trumbull         70  Village of Mariemont Village of Mariemont March 29, 2007 (#07000431 ) Mariemont 39°08′35″N  84°22′51″W  /  39.143056°N 84.380833°W  / 39.143056; -84.380833   (Village of Mariemont )  Hamilton         71  W.P. SNYDER, JR.  (Towboat)W.P. SNYDER, JR.  (Towboat)June 29, 1989 (#70000522 ) Marietta 39°25′06″N  81°27′48″W  /  39.418301°N 81.463291°W  / 39.418301; -81.463291   (W.P. SNYDER, JR.  (Towboat)  Washington         72  Wright Cycle Company And Wright Printing Shop Wright Cycle Company And Wright Printing Shop June 21, 1990 (#86000236 ) Dayton 39°45′20″N  84°12′43″W  /  39.755525°N 84.212047°W  / 39.755525; -84.212047   (Wright Cycle Company And Wright Printing Shop )  Montgomery         73  Wright Flyer III Wright Flyer III June 21, 1990 (#90001747 ) Dayton 39°43′33″N  84°12′07″W  /  39.725907°N 84.202073°W  / 39.725907; -84.202073   (Wright Flyer III )  Montgomery    1905 Wright Flyer III airplane     74  Colonel Charles Young House Colonel Charles Young House May 30, 1974 (#74001506 ) Wilberforce 39°42′26″N  83°53′25″W  /  39.707252°N 83.890227°W  / 39.707252; -83.890227   (Colonel Charles Young House )  Greene    Now the Charles Young Buffalo Soldiers National Monument .     75  Zero Gravity Research Facility Zero Gravity Research Facility October 3, 1985 (#85002801 ) Cleveland 41°24′37″N  81°51′51″W  /  41.410245°N 81.8641°W  / 41.410245; -81.8641   (Zero Gravity Research Facility )  Cuyahoga    vacuum chamber where drop tests are conducted to simulate low gravity conditions     76  Zoar Historic District Zoar Historic District October 31, 2016 (#16000859 ) Zoar 40°36′47″N  81°25′18″W  /  40.613056°N 81.421667°W  / 40.613056; -81.421667   (Zoar Historic District )  Tuscarawas    Only permanent home of the Society of Separatists in the United States.[ 14]