cahokia mound [1982]

1

carlsbad caverns [1995]

2023 - 1

chaco culture [1987]

2023 - 2

everglades [1979]

2010

2016 - 3

frank lloyd wright architecture [2019]

2016 - 4

glacier bay / kluane / tatshenshini [1979]

2

grand canyon [1979]

2010 - 5

great smoky mountains [1983]

3

hawaii volcanoes [1987]

4

hopewell ceremonial earthworks [2023]

2024 - 6

independence hall [1979]

2016 - 7

la fortaleza and san juan [1983]

5

mammoth cave [1981]

2024 - 8

mesa verde [1978]

2023 - 9

monticello [1987]

2016 - 10

olympic [1981]

2017 - 11

papahanaumokuakea [2010]

6

poverty point [2014]

2024 - 12

redwood [1980]

7

san antonio missions [2015]

2024 - 13

statue of liberty [1984]

2016 - 14

taos pueblo [1992]

2023 - 15

waterton glacier [1995]

8

yellowstone [1978]

2023 - 16

yosemite [1984]

2023 - 17