As of 2020, there were 84 National Monuments administered by the National Park Service.
The 24 National Monuments visited by Gram and Pops are listed in black.
You can see pictures of their trips by going back and clicking
on the List of Visited Parks link above and then selecting
National Monuments Visited by Gram and Pops.

Name
      Location
African Burial Ground National Monument       New York
Agate Fossil Beds National Monument       Nebraska
Alibates Flint Quarries National Monument       Texas
Aniakchak National Monument       Alaska
Aztec Ruins National Monument       New Mexico
         
Bandelier National Monument       New Mexico
Belmont–Paul Women's Equality National Monument       District of Columbia
Birmingham Civil Rights National Monument       Alabama
Booker T. Washington National Monument       Virginia
Buck Island Reef National Monument       U.S. Virgin Islands
         
Cabrillo National Monument       California
Camp Nelson Heritage National Monument       Kentucky
Canyon de Chelly National Monument       Arizona
Cape Krusenstern National Monument       Alaska
Capulin Volcano National Monument       New Mexico
Casa Grande Ruins National Monument       Arizona
Castillo de San Marcos National Monument       Florida
Castle Clinton National Monument       New York
Castle Mountains National Monument       California
Cedar Breaks National Monument       Utah
César E. Chávez National Monument       California
Charles Young Buffalo Soldiers National Monument       Ohio
Chiricahua National Monument       Arizona
Colorado National Monument       Colorado
Craters of the Moon National Monument       Idaho
         
Devils Postpile National Monument       California
Devils Tower National Monument       Wyoming
Dinosaur National Monument       Utah, Colorado
         
Effigy Mounds National Monument       Iowa
El Malpais National Monument       New Mexico
El Morro National Monument       New Mexico
         
Florissant Fossil Beds National Monument       Colorado
Fort Frederica National Monument       Georgia
Fort Matanzas National Monument       Florida
Fort McHenry National Monument       Maryland
Fort Monroe National Monument       Virginia
Fort Pulaski National Monument       Georgia
Fort Stanwix National Monument       New York
Fort Union National Monument       New Mexico
Fossil Butte National Monument       Wyoming
Freedom Riders National Monument       Alabama
         
George Washington Birthplace National Monument       Virginia
George Washington Carver National Monument       Missouri
Gila Cliff Dwellings National Monument       New Mexico
Governors Island National Monument       New York
Grand Canyon-Parashant National Monument       Arizona
Grand Portage National Monument       Minnesota
         
Hagerman Fossil Beds National Monument       Idaho
Hohokam Pima National Monument       Arizona
Homestead National Monument of America       Nebraska
Hovenweep National Monument       Colorado, Utah
         
Jewel Cave National Monument       South Dakota
John Day Fossil Beds National Monument       Oregon
         
Katahdin Woods and Waters National Monument       Maine
         
Lava Beds National Monument       California
Little Bighorn Battlefield National Monument       Montana
         
Montezuma Castle National Monument       Arizona
Muir Woods National Monument       California
         
Natural Bridges National Monument       Utah
Navajo National Monument       Arizona
         
Oregon Caves National Monument       Oregon
Organ Pipe Cactus National Monument       Arizona
         
Petroglyph National Monument       New Mexico
Pipe Spring National Monument       Arizona
Pipestone National Monument       Minnesota
Poverty Point National Monument       Louisiana
Pullman National Monument       Illinois
         
Rainbow Bridge National Monument       Utah
Russell Cave National Monument       Alabama
         
Salinas Pueblo Missions National Monument       New Mexico
Scotts Bluff National Monument       Nebraska
Statue of Liberty National Monument       New York, New Jersey
Stonewall National Monument       New York
Sunset Crater Volcano National Monument       Arizona
         
Timpanogos Cave National Monument       Utah
Tonto National Monument       Arizona
Tule Lake National Monument       California
Tule Springs Fossil Beds National Monument       Nevada
Tuzigoot National Monument       Arizona
         
Virgin Islands Coral Reef National Monument       U.S. Virgin Islands
         
Waco Mammoth National Monument       Texas
Walnut Canyon National Monument       Arizona
Wupatki National Monument       Arizona
         
Yucca House National Monument       Colorado


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