[2] Landmark name Image Date designated [3] Location County Description 1 Accokeek Creek Site Accokeek Creek Site July 19, 1964 (# 66000909 ) Accokeek 38°41′46″N 77°03′07″W / 38.696028°N 77.051833°W / 38.696028; -77.051833 (Accokeek Creek Site ) Prince George's Archaeological site of a palisaded village occupied from ca. A.D. 1300 to ca. 1630 2 Army Medical Museum and Library Army Medical Museum and Library January 12, 1965 (# 66000854 ) Silver Spring 39°00′32″N 77°03′14″W / 39.008889°N 77.053889°W / 39.008889; -77.053889 (Army Medical Museum and Library ) Montgomery This listing presently encompasses a US military medical records and research collection that dates to the 1860s. The original building in Washington, D.C. was demolished in 1969; the collection is now principally with the National Museum of Health and Medicine . The landmark designation is undergoing review. 3 BALTIMORE (Tug) BALTIMORE (Tug) November 4, 1993 (# 93001613 ) Baltimore 39°16′22″N 76°36′01″W / 39.27270°N 76.60027°W / 39.27270; -76.60027 (BALTIMORE (Tug) ) City of Baltimore Oldest steam-powered tugboat in operation in the United States 4 Baltimore and Ohio Transportation Museum and Mount Clare Station Baltimore and Ohio Transportation Museum and Mount Clare Station September 15, 1961 (# 66000906 ) Baltimore 39°17′01″N 76°37′57″W / 39.28352°N 76.63240°W / 39.28352; -76.63240 (Baltimore and Ohio Transportation Museum and Mount Clare Station ) City of Baltimore Part of oldest American railyard; site of first passenger rail service and first telegraph message. Collections of 19th- and 20th-century artifacts related to America's railroads; 250 pieces of railroad rolling stock; 15,000 artifacts; four nineteenth-century buildings, including the historic roundhouse; a mile of historic track. Larg 5 Clara Barton House Clara Barton House January 12, 1965 (# 66000037 ) Glen Echo 38°58′03″N 77°08′28″W / 38.96756°N 77.14114°W / 38.96756; -77.14114 (Clara Barton House ) Montgomery Home of Clara Barton; American pioneer teacher, nurse, and humanitarian; founder of the American Red Cross 6 Bollman Truss Railroad Bridge Bollman Truss Railroad Bridge February 16, 2000 (# 72000582 ) Savage 39°08′05″N 76°49′31″W / 39.134722°N 76.825278°W / 39.134722; -76.825278 (Bollman Truss Railroad Bridge ) Howard Sole surviving example of the first successful all-metal bridge design to be adopted and consistently used on a railroad 7 Brice House Brice House April 15, 1970 (# 70000259 ) Annapolis 38°58′45″N 76°29′14″W / 38.97917°N 76.48722°W / 38.97917; -76.48722 (Brice House ) Anne Arundel Preserved 18th century Georgian style brick house 8 Carrollton Viaduct Carrollton Viaduct November 11, 1971 (# 71001032 ) Baltimore 39°16′24″N 76°39′19″W / 39.27339°N 76.65529°W / 39.27339; -76.65529 (Carrollton Viaduct ) City of Baltimore Oldest operating railway bridge in the world. 9 Rachel Carson House Rachel Carson House December 4, 1991 (# 91002058 ) Silver Spring 39°02′48″N 77°00′03″W / 39.04667°N 77.00092°W / 39.04667; -77.00092 (Rachel Carson House ) Montgomery House where Rachel Carson wrote her classic work Silent Spring in 1962 10 Casselmans Bridge, National Road Casselmans Bridge, National Road January 29, 1964 (# 66000391 ) Grantsville 39°41′48″N 79°08′37″W / 39.696667°N 79.143611°W / 39.696667; -79.143611 (Casselmans Bridge, National Road ) Garrett Bridge built in 1813 on the National Road , the nation's first major public works project 11 Whittaker Chambers Farm Whittaker Chambers Farm May 17, 1988 (# 88001824 ) Westminster 39°39′35″N 76°58′35″W / 39.659722°N 76.976389°W / 39.659722; -76.976389 (Whittaker Chambers Farm ) Carroll Farm home of Whittaker Chambers, accuser of Alger Hiss ; papers hidden here in a pumpkin led to Hiss's conviction; Chambers wrote Witness , his best-selling autobiography, here 12 Chase-Lloyd House Chase-Lloyd House April 15, 1970 (# 70000260 ) Annapolis 38°58′52″N 76°29′18″W / 38.98121°N 76.48838°W / 38.98121; -76.48838 (Chase-Lloyd House ) Anne Arundel Three-story brick Georgian mansion dating from 1769-1774 13 Chestertown Historic District Chestertown Historic District April 15, 1970 (# 70000263 ) Chestertown 39°12′45″N 76°04′10″W / 39.2125°N 76.069444°W / 39.2125; -76.069444 (Chestertown Historic District ) Kent 14 College of Medicine of Maryland College of Medicine of Maryland September 25, 1997 (# 97001275 ) Baltimore 39°17′16″N 76°37′23″W / 39.28778°N 76.62315°W / 39.28778; -76.62315 (College of Medicine of Maryland ) City of Baltimore Oldest medical school building in the U.S. 15 Colonial Annapolis Historic District Colonial Annapolis Historic District June 23, 1965 (# 66000383 ) Annapolis 38°58′41″N 76°29′29″W / 38.978056°N 76.491389°W / 38.978056; -76.491389 (Colonial Annapolis Historic District ) Anne Arundel NRHP 66000383, and boundary increase NRHP 84003875, in 1984. 16 USS CONSTELLATION (Frigate) USS CONSTELLATION (Frigate) May 23, 1963 (# 66000918 ) Baltimore 39°17′03″N 76°36′42″W / 39.28426°N 76.61166°W / 39.28426; -76.61166 (USS CONSTELLATION (Frigate) ) City of Baltimore Constructed in 1854; sloop-of-war, or corvette; second United States Navy ship to carry this famous name 17 Doughoregan Manor Doughoregan Manor November 11, 1971 (# 71000376 ) Ellicott City 39°16′36″N 76°53′35″W / 39.276667°N 76.893056°W / 39.276667; -76.893056 (Doughoregan Manor ) Howard Built in 1766; until 1832 home of Charles Carroll , last surviving signer of the Declaration of Independence 18 EDNA E. LOCKWOOD (Bugeye) EDNA E. LOCKWOOD (Bugeye) April 19, 1994 (# 86000258 ) St. Michaels 38°47′08″N 76°13′10″W / 38.78568°N 76.21941°W / 38.78568; -76.21941 (EDNA E. LOCKWOOD (Bugeye) ) Talbot Built in 1889; Chesapeake Bay bugeye; last working oyster boat of her kind 19 Ellicott City Station Ellicott City Station November 24, 1968 (# 68000025 ) Ellicott City 39°15′56″N 76°47′43″W / 39.26544°N 76.79529°W / 39.26544; -76.79529 (Ellicott City Station ) Howard 20 First Unitarian Church First Unitarian Church November 7, 1973 (# 72001495 ) Baltimore 39°17′36″N 76°36′58″W / 39.29340°N 76.61611°W / 39.29340; -76.61611 (First Unitarian Church ) City of Baltimore 21 Fort Frederick Fort Frederick November 7, 1973 (# 73000939 ) Big Pool 39°36′33″N 78°01′17″W / 39.609167°N 78.021389°W / 39.609167; -78.021389 (Fort Frederick ) Washington 22 Frieda Fromm-Reichmann Cottage Frieda Fromm-Reichmann Cottage January 13, 2021 (# 100006277 ) Rockville 39°04′59″N 77°09′44″W / 39.0831°N 77.1622°W / 39.0831; -77.1622 (Frieda Fromm-Reichmann Cottage ) Montgomery 23 Gaithersburg Latitude Observatory Gaithersburg Latitude Observatory December 20, 1989 (# 85001578 ) Gaithersburg 39°08′05″N 77°11′57″W / 39.13472°N 77.19908°W / 39.13472; -77.19908 (Gaithersburg Latitude Observatory ) Montgomery 24 Greenbelt, Maryland Historic District Greenbelt, Maryland Historic District February 18, 1997 (# 80004331 ) Greenbelt 39°00′10″N 76°53′28″W / 39.002778°N 76.891111°W / 39.002778; -76.891111 (Greenbelt, Maryland Historic District ) Prince George's 25 Habre-de-venture Habre-de-venture November 11, 1971 (# 72001595 ) Port Tobacco 38°31′43″N 77°01′54″W / 38.52872°N 77.03155°W / 38.52872; -77.03155 (Habre-de-venture ) Charles Now the Thomas Stone National Historic Site. 26 Hammond-Harwood House Hammond-Harwood House October 9, 1960 (# 66000384 ) Annapolis 38°58′52″N 76°29′18″W / 38.98124°N 76.48832°W / 38.98124; -76.48832 (Hammond-Harwood House ) Anne Arundel 27 HILDA M. WILLING (Skipjack) HILDA M. WILLING (Skipjack) April 19, 1994 (# 85001089 ) Tilghman 38°42′40″N 76°19′53″W / 38.71102°N 76.33142°W / 38.71102; -76.33142 (HILDA M. WILLING (Skipjack) ) Talbot 28 His Lordship's Kindness His Lordship's Kindness April 15, 1970 (# 70000853 ) Rosaryville 38°46′44″N 76°50′34″W / 38.778889°N 76.842778°W / 38.778889; -76.842778 (His Lordship's Kindness ) Prince George's Also known as Poplar Hill. 29 Homewood Homewood November 11, 1971 (# 71001033 ) Baltimore 39°19′39″N 76°37′09″W / 39.32756°N 76.61917°W / 39.32756; -76.61917 (Homewood ) City of Baltimore 30 KATHRYN (Skipjack) KATHRYN (Skipjack) April 19, 1994 (# 85001090 ) Tilghman Island 38°42′40″N 76°19′53″W / 38.71102°N 76.33142°W / 38.71102; -76.33142 (KATHRYN (Skipjack) ) Talbot 31 Kennedy Farm Kennedy Farm November 7, 1973 (# 73000941 ) Samples Manor 39°22′47″N 77°42′56″W / 39.379722°N 77.715556°W / 39.379722; -77.715556 (Kennedy Farm ) Washington Headquarters for John Brown's 1859 raid on Harpers Ferry. 32 LIGHTSHIP NO. 116 "CHESAPEAKE " LIGHTSHIP NO. 116 "CHESAPEAKE " December 20, 1989 (# 80000349 ) Baltimore 39°17′01″N 76°36′34″W / 39.28375°N 76.60956°W / 39.28375; -76.60956 (LIGHTSHIP NO. 116 "CHESAPEAKE " ) City of Baltimore Built in 1930 at Charleston Drydock & Machine Co; took on the name of whatever station she was anchored at 33 London Town Publik House London Town Publik House April 15, 1970 (# 70000262 ) Woodland Beach 38°56′23″N 76°32′25″W / 38.93967°N 76.54026°W / 38.93967; -76.54026 (London Town Publik House ) Anne Arundel A county alms house 34 J. C. Lore Oyster House J. C. Lore Oyster House August 7, 2001 (# 84003869 ) Solomons 38°19′26″N 76°27′40″W / 38.323889°N 76.461111°W / 38.323889; -76.461111 (J. C. Lore Oyster House ) Calvert 35 Maryland Statehouse Maryland Statehouse December 19, 1960 (# 66000385 ) Annapolis 38°58′36″N 76°29′28″W / 38.97663°N 76.49107°W / 38.97663; -76.49107 (Maryland Statehouse ) Anne Arundel 36 Elmer V. McCollum House Elmer V. McCollum House January 7, 1976 (# 76002182 ) Baltimore 39°18′49″N 76°41′06″W / 39.313611°N 76.685°W / 39.313611; -76.685 (Elmer V. McCollum House ) City of Baltimore Home of nutrition researcher Elmer McCollum . 37 H. L. Mencken House H. L. Mencken House July 28, 1983 (# 83004384 ) Baltimore 39°17′08″N 76°38′29″W / 39.28556°N 76.64137°W / 39.28556; -76.64137 (H. L. Mencken House ) City of Baltimore A home of author H. L. Mencken . The house is included in the Union Square-Hollins Market Historic District . 38 Minor Basilica of the Assumption of the Blessed Virgin Mary Minor Basilica of the Assumption of the Blessed Virgin Mary November 11, 1971 (# 69000330 ) Baltimore 39°17′36″N 76°36′58″W / 39.29340°N 76.61611°W / 39.29340; -76.61611 (Minor Basilica of the Assumption of the Blessed Virgin Mary ) City of Baltimore 39 Monocacy Battlefield Monocacy Battlefield November 8, 1973 (# 66000908 ) Frederick 39°22′16″N 77°23′31″W / 39.37115°N 77.39208°W / 39.37115; -77.39208 (Monocacy Battlefield ) Frederick 40 Montpelier Montpelier April 15, 1970 (# 70000852 ) Laurel 39°03′54″N 76°50′42″W / 39.065°N 76.845°W / 39.065; -76.845 (Montpelier ) Prince George's 41 Mount Clare Mount Clare April 15, 1970 (# 70000860 ) Baltimore 39°16′37″N 76°38′37″W / 39.27697°N 76.64349°W / 39.27697; -76.64349 (Mount Clare ) City of Baltimore 42 Mount Royal Station and Trainshed Mount Royal Station and Trainshed December 8, 1976 (# 73002191 ) Baltimore 39°18′14″N 76°37′14″W / 39.30378°N 76.62046°W / 39.30378; -76.62046 (Mount Royal Station and Trainshed ) City of Baltimore 43 Mount Vernon Place Historic District Mount Vernon Place Historic District November 11, 1971 (# 71001037 ) Baltimore 39°17′51″N 76°36′56″W / 39.297493°N 76.61565°W / 39.297493; -76.61565 (Mount Vernon Place Historic District ) City of Baltimore 44 NELLIE CROCKETT (Buy-boat) NELLIE CROCKETT (Buy-boat) April 19, 1994 (# 94001185 ) Georgetown 39°21′40″N 75°52′55″W / 39.36110°N 75.88183°W / 39.36110; -75.88183 (NELLIE CROCKETT (Buy-boat) ) Kent Chesapeake Bay oyster buy-boat; built in 1926. 45 Old Lock Pump House, Chesapeake and Delaware Canal Old Lock Pump House, Chesapeake and Delaware Canal January 12, 1965 (# 66000390 ) Chesapeake City 39°31′26″N 75°48′39″W / 39.52380°N 75.81070°W / 39.52380; -75.81070 (Old Lock Pump House, Chesapeake and Delaware Canal ) Cecil 46 William Paca House William Paca House November 11, 1971 (# 71000364 ) Annapolis 38°58′46″N 76°29′17″W / 38.97944°N 76.48793°W / 38.97944; -76.48793 (William Paca House ) Anne Arundel 47 Peale's Baltimore Museum Peale's Baltimore Museum December 21, 1965 (# 66000915 ) Baltimore 39°17′24″N 76°36′38″W / 39.29004°N 76.61063°W / 39.29004; -76.61063 (Peale's Baltimore Museum ) City of Baltimore 48 Phoenix Shot Tower Phoenix Shot Tower November 11, 1971 (# 69000373 ) Baltimore 39°17′19″N 76°36′20″W / 39.28867°N 76.60556°W / 39.28867; -76.60556 (Phoenix Shot Tower ) City of Baltimore 49 Edgar Allan Poe House Edgar Allan Poe House November 11, 1971 (# 71001043 ) Baltimore 39°17′21″N 76°38′00″W / 39.28923°N 76.63334°W / 39.28923; -76.63334 (Edgar Allan Poe House ) City of Baltimore 50 REBECCA T. RUARK (Skipjack) REBECCA T. RUARK (Skipjack) July 31, 2003 (# 85001095 ) Tilghman Island 38°42′46″N 76°19′53″W / 38.712778°N 76.331389°W / 38.712778; -76.331389 (REBECCA T. RUARK (Skipjack) ) Talbot 51 Ira Remsen House Ira Remsen House May 15, 1975 (# 75002102 ) Baltimore 39°17′51″N 76°37′09″W / 39.297462°N 76.619263°W / 39.297462; -76.619263 (Ira Remsen House ) City of Baltimore 52 Riversdale Mansion Riversdale Mansion December 9, 1997 (# 73002166 ) Riverdale 38°57′37″N 76°55′55″W / 38.960278°N 76.931944°W / 38.960278; -76.931944 (Riversdale Mansion ) Prince George's 53 Henry August Rowland House Henry August Rowland House May 15, 1975 (# 75002098 ) Baltimore 39°18′02″N 76°37′02″W / 39.300505°N 76.617358°W / 39.300505; -76.617358 (Henry August Rowland House ) City of Baltimore Home of physicist Henry Augustus Rowland . 54 St. Mary's City Historic District St. Mary's City Historic District August 4, 1969 (# 69000310 ) St. Marys City 38°11′21″N 76°25′56″W / 38.189167°N 76.432222°W / 38.189167; -76.432222 (St. Mary's City Historic District ) St. Mary's 55 St. Mary's Seminary Chapel St. Mary's Seminary Chapel November 11, 1971 (# 71001046 ) Baltimore 39°17′38″N 76°37′23″W / 39.29401°N 76.62302°W / 39.29401; -76.62302 (St. Mary's Seminary Chapel ) City of Baltimore 56 N.S. SAVANNAH (Nuclear Ship) N.S. SAVANNAH (Nuclear Ship) July 17, 1991 (# 82001518 ) Baltimore 39°15′30″N 76°33′20″W / 39.258472°N 76.555417°W / 39.258472; -76.555417 (N.S. SAVANNAH (Nuclear Ship) ) City of Baltimore 57 Schifferstadt Schifferstadt December 23, 2016 (# 100000833 ) Frederick 39°25′24″N 77°25′39″W / 39.423333°N 77.4275°W / 39.423333; -77.4275 (Schifferstadt ) Frederick County 58 Sheppard and Enoch Pratt Hospital and Gate House Sheppard and Enoch Pratt Hospital and Gate House November 11, 1971 (# 71000369 ) Towson 39°23′28″N 76°37′09″W / 39.391111°N 76.619167°W / 39.391111; -76.619167 (Sheppard and Enoch Pratt Hospital and Gate House ) Baltimore County 59 Sion Hill Sion Hill April 27, 1992 (# 90000608 ) Havre De Grace 39°33′58″N 76°07′39″W / 39.56606°N 76.12740°W / 39.56606; -76.12740 (Sion Hill ) Harford 60 Sotterley Sotterley February 16, 2000 (# 72001487 ) Hollywood 38°22′47″N 76°32′20″W / 38.379722°N 76.538889°W / 38.379722; -76.538889 (Sotterley ) St. Mary's 61 Spacecraft Magnetic Test Facility Spacecraft Magnetic Test Facility October 3, 1985 (# 85002811 ) Greenbelt 39°00′17″N 76°49′31″W / 39.00485°N 76.82541°W / 39.00485; -76.82541 (Spacecraft Magnetic Test Facility ) Prince George's 62 Star-Spangled Banner Flag House Star-Spangled Banner Flag House December 16, 1969 (# 69000320 ) Baltimore 39°17′08″N 76°36′13″W / 39.28563°N 76.60358°W / 39.28563; -76.60358 (Star-Spangled Banner Flag House ) City of Baltimore House where Mary Young Pickersgill sewed the large Star-Spangled Banner flag of the United States, to fly over Fort McHenry , inspiring the U.S. national anthem. 63 Peggy Stewart House Peggy Stewart House November 7, 1973 (# 73000887 ) Annapolis 38°58′55″N 76°29′14″W / 38.98189°N 76.48725°W / 38.98189; -76.48725 (Peggy Stewart House ) Anne Arundel 64 USCGC WHEC-37 (Coast Guard cutter) USCGC WHEC-37 (Coast Guard cutter) June 7, 1988 (# 88001826 ) Baltimore 39°17′09″N 76°36′23″W / 39.285833°N 76.606389°W / 39.285833; -76.606389 (USCGC WHEC-37 (Coast Guard cutter) ) City of Baltimore 65 Thomas Point Shoal Light Station Thomas Point Shoal Light Station January 20, 1999 (# 75000864 ) Annapolis 38°53′56″N 76°26′10″W / 38.899°N 76.436°W / 38.899; -76.436 (Thomas Point Shoal Light Station ) Anne Arundel 66 Thomas Viaduct, Baltimore & Ohio Railroad Thomas Viaduct, Baltimore & Ohio Railroad January 28, 1964 (# 66000388 ) Relay 39°13′12″N 76°42′49″W / 39.22000°N 76.71351°W / 39.22000; -76.71351 (Thomas Viaduct, Baltimore & Ohio Railroad ) Baltimore County & Howard County 67 Tolson's Chapel and School Tolson's Chapel and School January 13, 2021 (# 100006233 ) 111 E. High St. 39°27′22″N 77°44′47″W / 39.4561°N 77.7464°W / 39.4561; -77.7464 (Tolson's Chapel and School ) Washington 68 USS TORSK (Submarine) USS TORSK (Submarine) January 14, 1986 (# 86000090 ) Baltimore 39°16′58″N 76°36′33″W / 39.28285°N 76.60908°W / 39.28285; -76.60908 (USS TORSK (Submarine) ) City of Baltimore 69 Tulip Hill Tulip Hill April 15, 1970 (# 70000261 ) Galesville 38°51′03″N 76°33′02″W / 38.850833°N 76.550556°W / 38.850833; -76.550556 (Tulip Hill ) Anne Arundel 70 United States Naval Academy United States Naval Academy July 4, 1961 (# 66000386 ) Annapolis 38°59′04″N 76°29′20″W / 38.98443°N 76.48888°W / 38.98443; -76.48888 (United States Naval Academy ) Anne Arundel 71 Washington Aqueduct Washington Aqueduct November 7, 1973 (# 73002123 ) Great Falls, MD and Washington, DC 38°56′15″N 77°06′51″W / 38.9375°N 77.114167°W / 38.9375; -77.114167 (Washington Aqueduct ) Montgomery, MD and District of Columbia Also in District of Columbia 72 William Henry Welch House William Henry Welch House January 7, 1976 (# 76002186 ) Baltimore 39°18′00″N 76°36′51″W / 39.30008°N 76.61428°W / 39.30008; -76.61428 (William Henry Welch House ) City of Baltimore 73 West St. Mary's Manor West St. Mary's Manor April 15, 1970 (# 70000854 ) Drayden 38°11′10″N 76°26′54″W / 38.186111°N 76.448333°W / 38.186111; -76.448333 (West St. Mary's Manor ) St. Mary's 74 Whitehall Whitehall October 9, 1960 (# 66000387 ) Annapolis 39°00′15″N 76°25′37″W / 39.004167°N 76.426944°W / 39.004167; -76.426944 (Whitehall ) Anne Arundel 75 WILLIAM. B. TENNISON (Buy-Boat) WILLIAM. B. TENNISON (Buy-Boat) April 19, 1994 (# 80001799 ) Solomons 38°19′23″N 76°27′39″W / 38.32315°N 76.46089°W / 38.32315; -76.46089 (WILLIAM. B. TENNISON (Buy-Boat) ) Calvert 76 Wye House Wye House April 15, 1970 (# 70000264 ) Easton 38°51′12″N 76°10′06″W / 38.853398°N 76.168406°W / 38.853398; -76.168406 (Wye House ) Talbot