| Country
|
Subdivision
|
Site
|
 United States
|
 Arizona
|
 Grand Canyon National Park
|
 California
|
Yosemite National Park
|
 Kentucky
|
Mammoth Cave National Park
|
 Idaho
 Montana
 Wyoming
|
Yellowstone National Park
|
 Illinois & other locations
|
20th Century Architecture of Frank Lloyd Wright
|
 Louisiana
|
Poverty Point
|
 New York
|
Statue of Liberty
|
 North Carolina
 Tennessee
|
Great Smoky Mountains National Park
|
 Pennsylvania
|
Independence Hall
|
 Puerto Rico
|
La Fortaleza and San Juan NHS
|
 Texas
|
San Antonio Missions
|
 Virginia
|
Monticello & University of Virginia
|
 Washington
|
Olympic National Park
|
 Canada
United States
|
 British Columbia
Montana
|
Waterton-Glacier International Peace Park
|
| Canada
|
 Alberta
British Columbia
|
Canadian Rocky Mountain Parks
|
 Ontario
|
Rideau Canal
|
 Quebec
|
Historic District of Old Quebec
|
