Spiro Mounds State Park; Oklahoma

Moon over Pinnacles; Pinnacles National Monument, California

Sage Creek Wilderness Area; Badlands National Park, South ...

Sunset and Joshua trees; Joshua Tree National Monument, ...

Predawn light; Whiteshell Provincial Park, Manitoba

Detail of catlinite cliff; Pipestone National Monument, Pipestone, ...

Composite of moon, trees and human effigy, Bannock ...

Autumn foliage; Stone Mountain Park, Georgia

Bison and fire-swept slope; Yellowstone National Park, Wyoming

Echo Canyon; Zion National Park, Utah

Wanuskewin; Heritage Park, Saskatoon, Saskatchewan

Cliff face, Cable Mountain; Sion National Park, Utah

Cliff palace and cliff face; Mesa Verde National ...

Moonrise Over Bryce; Bryce Canyon National Park, Utah

Reflected sunlight on sandstone formations; Antelope Canyon, Page, ...

Boulders and trees; Ringing Rocks State Park, Pennsylvania

Aerial view of bottom sand patterns; William River, ...

Lunar Necklace; Chaco Culture National Historic Park

Reflected sunlight on sandstone formations; Antelope Canyon, Page, ...

Doors, Pueblo Bonito; Chaco Culture National Historic Park, ...