There are approximatley 2,442 National Historic Landmarks in the USA, which you can view U.S. National Historic Landmarks by state, and so far I have only visited 130 of them.

1990’s [17]

1. Ohio Statehouse – Columbus, OH
   
2. Ohio Theatre – Columbus, OH
3. Edison Institute (Greenfield Village and Henry Ford Museum) – Dearborn, MI
4. USS Yorktown – Charleston, SC
5. NS Savannah – Charleston, SC (now located in Baltimore, MD)
6. Arts and Industries Building, Smithsonian Institution – Washington, DC
7. Smithsonian Institution Building – Washington, DC
8. Supreme Court Building – Washington, DC
9. Washington Navy Yard – Washington, DC
10. White House – Washington, DC
11. Franklin Delano Roosevelt Memorial – Washington, DC
12. Ford’s Theatre National Historic Site – Washington, DC
13. Korean War Veterans Memorial – Washington, DC
14. Lincoln Memorial – Washington, DC
15. Thomas Jefferson Memorial – Washington, DC
16. Vietnam Veterans Memorial – Washington, DC
17. Washington Monument – Washington, DC

1997 [11]

1. Carew Tower – Cincinnati, OH
2. Cincinnati Music Hall – Cincinnati, OH
3. Cincinnati Union Terminal – Cincinnati, OH
4. Cincinnati Zoo Historic Structure – Cincinnati, OH
5. Covington And Cincinnati Suspension Bridge – Cincinnati, OH
6. Plum Street Temple – Cincinnati, OH
7. Spring Grove Cemetery – Cincinnati, OH
8. Village of Mariemont – Cincinnati, OH
9. North Christian Church – Columbus, IN
10. Irwin Union Bank and Trust – Columbus, IN
11. First Christian Church – Columbus, IN
    

1998 [45]

1. Allegheny County Courthouse and Jail – Pittsburgh, PA
2. Fallingwater – Mill Run, PA
3. Beacon Hill Historic District – Boston, MA
4. Boston Public Garden – Boston, MA
5. Boston Public Library – Boston, MA
6. Faneuil Hall – Boston, MA
7. Massachusetts Statehouse – Boston, MA
8. Old North Church – Boston, MA
9. Old South Meeting House – Boston, MA
10. Old State House – Boston, MA
11. Quincy Market – Boston, MA
12. Paul Revere House – Boston, MA
    Out one night searching for delicious Italian desserts, we stumbled upon this house at night after a series of wrong turns
13. Tremont Street Subway – Boston, MA
14. Trinity Church – Boston, MA
    I took part in a sunday service the week my grandfather had a heart attack
15. Massachusetts Hall, Harvard University – Cambridge, MA
16. Memorial Hall (Harvard University) – Cambridge, MA
17. Sever Hall (Harvard University) – Cambridge, MA
18. University Hall (Harvard University) – Cambridge, MA
19. Slater Mill Historic Site – Pawtucket, RI
20. New Haven Green – New Haven, CT
21. Revere Beach – Revere, MA
22. Brooklyn Bridge – New York City, NY
23. Central Park – New York City, NY
24. Chrysler Building – New York City, NY
25. City Hall – New York City, NY
26. Cooper Union – New York City, NY
27. Dakota Apartments – New York City, NY
28. Empire State Building – New York City, NY
29. Flatiron Building – New York City, NY
30. Grand Central Terminal – New York City, NY
31. Holland Tunnel – New York City, NY
32. Metropolitan Life Insurance Company Tower – New York City, NY
33. Metropolitan Museum of Art – New York City, NY
34. New York Public Library – New York City, NY
35. New York Stock Exchange – New York City, NY
36. Plaza Hotel – New York City, NY
37. Rockefeller Center – New York City, NY
38. St. Patrick’s Cathedral – New York City, NY
39. SoHo-Cast Iron Historic District – New York City, NY
40. Tiffany and Company Building – New York City, NY
41. Trinity Church – New York City, NY
42. Tweed Courthouse – New York City, NY
43. Union Square – New York City, NY
44. U.S. Customhouse – New York City, NY
45. Woolworth Building – New York City, NY
    

2000 [5]

1. Alcatraz Island – San Francisco, CA
2. Aquatic Park Historic District – San Francisco, CA
3. San Francisco Cable Cars – San Francisco, CA
4. Santa Cruz Looff Carousel and Roller Coaster – Santa Cruz, CA
5. Fort Point National Historic Site – San Francisco, CA

2001 [1]

1. Cincinnati Observatory – Cincinnati, OH

2002 [5]

1. Carson, Pirie, Scott, and Company Store – Chicago, IL
2. Marshall Field and Company Building – Chicago, IL
3. Reliance Building – Chicago, IL
4. Rookery Building – Chicago, IL
5. S.R. Crown Hall – Chicago, IL

2003 [10]

1. Jekyll Island Club
2. Fort Frederica National Monument – St. Simon’s Island, GA
3. New Harmony Historic District – New Harmony, IN
4. Hinkle Fieldhouse – Indianapolis, IN
5. Keeneland Race Course – Lexington, KY
6. Old State House – Frankfort, KY
7. Shakertown at Pleasant Hill Historic District – Harrodsburg, KY
8. Brooklyn Heights Historic District – New York City, NY
9. R. H. Macy and Company Store – New York City, NY
   When I first tried to find Macy’s I didn’t know where it was. Then my mother reminded me about Miracle on 34th Street.
10. Third Judicial District Courthouse – New York City, NY

2004 [2]

1. Equitable Building – New York City, NY
2. Stonewall – New York City, NY

2005 [5]

1. Vizcaya
2. Fort Zachary Taylor – Key West, FL (also visited in 2011)
3. Ernest Hemingway House
4. Palisades Interstate Park – NY
5. Low Memorial Library – New York City, NY

2006 [9]

1. Central of Georgia Railroad: Savannah Shops and Terminal Facilities – Savannah, GA
2. Liberty Memorial
3. Washburn “A” Mill
4. Tenement Building at 97 Orchard Street – New York City, NY
5. Washington’s Headquarters – Valley Forge, PA
6. Second Bank of the United States – Philadelphia, PA
7. The Hermitage – Nashville, TN
   
8. Ryman Auditorium – Nashville, TN
   
9. Tennessee State Capitol – Nashville, TN
   

2007 [2]

1. Glass House – New Canaan, CT
   
2. Carnegie Hall – New York City, NY

2008 [1]

1. Governors Island – New York City, NY

2009 [7]

1. Lahaina Historic District – Lahaina, HI
2. Montgomery Ward Company Complex – Chicago, IL
3. Farnsworth House – Plano, IL
4. Pierpont Morgan Library – New York City, NY
5. Dealey Plaza Historic District – Dallas, TX
   
6. Georgetown Historic District – Georgetown
7. Chesapeake and Ohio Canal National Historical Park – Washington, DC

2010 [6]

1. Arthur Heurtley House – Oak Park, IL
   
2. Unity Temple – Oak Park, IL (photos)
   
3. Frank Lloyd Wright Home And Studio – Oak Park, IL
4. Apollo Mission Control Center – Houston, TX
   
5. Blair House – Washington, DC
6. Old Patent Office – Washington, DC
7. 

2011 [4]

1. Adler Planetarium & Astronomy Museum – Chicago, IL
2. Cleveland Arcade
3. Shedd Aquarium – Chicago, IL
4. Cape Canaveral Air Force Station

2014 [9]

1. The Cabildo – New Orleans, LA
2. The Presbytere – New Orleans, LA
3. Napoleon House – New Orleans, LA
4. Jackson Square – New Orleans, LA
5. Pontalba Buildings – New Orleans, LA
6. Barrio De Analco Historic District – Santa Fe, NM
7. Palace of the Governors – Santa Fe, NM
8. Santa Fe Plaza – Santa Fe, NM
9. Montauk Point Light – Montauk, NY

2015 [1]

1. 69th Regiment Armory – New York, NY