Region
Abraham Lincoln Birthplace National Historical Park
2
Abraham Lincoln Birthplace National Historical Park (Ky.)
3
Abraham Lincoln National Heritage Area (Ill.)
2
Acadia National Park
4
Acadia National Park (Me.)
10
Adams National Historical Park (Quincy, Mass.)
1
Africa
2
Africa, East
1
Africa, Southern
4
Alabama
5
Alabama Hills (Calif.)
1
Alagnak Wild River
1
Alagnak Wild River (Alaska)
1
Alaska
62
Alaska Peninsula
1
Alaska, Southeast
1
Alaska, Southwest
1
Alberta
1
Alibates Flint Quarries National Monument
1
Alibates Flint Quarries National Monument (Tex.)
1
Allegheny National Forest
1
Allegheny National Forest (Pa.)
1
Alsek River
1
America
2
American Memorial Park (Northern Mariana Islands)
1
American Samoa
2
Antietam National Battlefield
1
Antietam National Battlefield (Md.)
2
Apostle Islands National Lakeshore
3
Apostle Islands National Lakeshore (Wis.)
4
Appalachian Region
1
Appalachian Trail
1
Appomattox Court House National Historical Park (Va.)
1
Arches National Park
1
Arches National Park (Utah)
6
Arctic National Wildlife Refuge (Alaska)
1
Arizona
28
Arkansas
6
Arkansas Post National Memorial
1
Arkansas Post National Memorial (Ark.)
1
Arusha National Park
2
Arusha National Park (Tanzania)
2
Assateague Island National Seashore (Md. and Va.)
2
Atchafalaya National Heritage Area (La.)
2
Atlanta
7
Atlantic Coast
1
Atlantic Coast (South Atlantic States)
4
Atlantic Coast (U.S.)
1
Australia
6
Barataria Preserve (La.)
2
more ...