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
|