Spiro Mounds State Park; Oklahoma

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

Predawn light; Whiteshell Provincial Park, Manitoba

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

Cliff face, Cable Mountain; Sion National Park, Utah

Erosional formations; Bryce Canyon National Park, Utah

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

Moonrise Over Bryce; Bryce Canyon National Park, Utah

Boulders and trees; Ringing Rocks State Park, Pennsylvania

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

Full Circle; Moose Mountain Medicine Wheel, Saskatchewan

Lunar Necklace; Chaco Culture National Historic Park

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

Report to the Secretary of State, Canada and ...

Dawn light on sand ridge; Great Sand hills, ...

Alligator and reflection, Anhinga Trail; Everglades National Park; ...

Rainbow kelp in tidal pool; Lyle Island, Pacific ...