Region
1732-1794
1
1775-1865
1
18th century
1
1913-1921
1
1921-1923
1
1933-1945
1
1945-1992
1
19th century
2
20th century
7
509th Army Air Field (N.M.)
1
7.150
1
:United States
1
ASEAN
1
Aachen
1
Abbottābād (Pakistan)
3
Aberdeen Proving Ground
1
Aberdeen Proving Ground (Md.)
4
Aberdeenshire
1
Ability testing
1
Abqaiq
1
Abraham Lincoln Birthplace National Historical Park
1
Abraham Lincoln Birthplace National Historical Park (Ky.)
1
Abruzzo (Italy)
1
Absaroka-Beartooth Wilderness (Mont. and Wyo.)
1
Acadia National Park
4
Acadia National Park (Me.)
6
Aceh
1
Adams County
2
Adams County (Pa.)
1
Adams National Historical Park (Quincy, Mass.)
1
Adelanto
1
Aden, Gulf of
1
Adirondack Mountains
3
Adirondack Mountains (N.Y.)
4
Adirondack Mountains Region
1
Adirondack Mountains Region (N.Y.)
1
Admiralty Islands
2
Admiralty Islands (Papua New Guinea)
1
Aegean Sea
1
Aegean Sea Region
1
Afghan War, 2001-
1
Afghanistan
696
Africa
459
Africa, Central
12
Africa, East
10
Africa, Eastern
3
Africa, French-speaking West
1
Africa, North
101
Africa, Northeast
1
Africa, Northwest
4
more ...