Region
Colorado
82
Southwest, New
52
Utah
52
New Mexico
40
North America
28
United States
24
Arizona
20
California
13
Oregon
13
Great Plains
11
Chaco Canyon (N.M.)
10
Wyoming
10
Chaco Canyon
9
Montana
9
Nevada
9
Ohio
9
Great Basin
8
Southern States
8
Alaska
7
Dolores River Valley (Colo. and Utah)
7
North Dakota
7
Little Bighorn Battlefield National Monument (Mont.)
6
Mesa Verde National Park (Colo.)
6
Missouri
6
Texas
6
West (U.S.)
6
Bandelier National Monument (N.M.)
5
Canyonlands National Park (Utah)
5
Cape Cod National Seashore
5
Cape Cod National Seashore (Mass.)
5
Effigy Mounds National Monument (Iowa)
5
Iowa
5
Kansas
5
Knife River Indian Villages National Historic Site (N.D.)
5
Massachusetts
5
Mesa Verde National Park
5
San Juan County
5
Four Corners Region
4
Idaho
4
Oklahoma
4
Pajarito Plateau
4
San Juan County (Utah)
4
America
3
Amistad National Recreation Area
3
Bears Ears National Monument (Utah)
3
Chaco Canyon Region
3
Colorado Plateau
3
Cuyahoga Valley National Park
3
Cuyahoga Valley National Park (Ohio)
3
Glen Canyon (Utah and Ariz.)
3
more ...