Mesa Verde National Park.

Mesa Verde National Park. Cliff-dwellings.

Mesa Verde National Park. Cliff-dwellings.

Mesa Verde National Park. Cliff-dwellings.

Mesa Verde National Park. Cliff-dwellings.

Monument Valley

Monument Valley

Monument Valley

Shiprock, a volcanic plug.

Colorado River above Glen Canyon.

Lake Powell

Lake Powell

Lake Powell

Antelope Canyon. A slot canyon. These can be very dangerous when there are thunderstorms upstream as walls of water can come rushing down these canyons.

Antelope Canyon. A slot canyon. These can be very dangerous when there are thunderstorms upstream as walls of water can come rushing down these canyons.

Antelope Canyon. A slot canyon. These can be very dangerous when there are thunderstorms upstream as walls of water can come rushing down these canyons.

The quintessential view of the Grand Canyon and the Colorado River. The majesty of the American West.

Bright Angel Trail

The Grand Canyon

The Grand Canyon

The Grand Canyon

The Grand Canyon dwarfing a human observer.

Crossing the Colorado River

The Colorado River

A particularly arid part of the desiccated Southwest

Water erosion of gulleys

A grey landscape

Red sandstone cliffs

A mesa with red and grey sedimentary layers

Erosional remnant of a sandstone mesa outside Sedona.

A red and white mesa looking vaguely like the silhouette of an aircraft carrier

The city of Sedona.

Oak Creek Canyon

Open range warning

Setting sun illuminating red sandstone cliffs

A tinge of fall in south central Alaska

A ribbon of cloud separates mountain and valley. A prominent landslide scar sweeps an arc across the mountain. Dredge spoils from mining lines the river on the right of the image.

A river valley cutting through central Alaska along the George Parks Highway.

Mountains and a braided stream along the George Parks Highway.

Fall colors paint the Alaska landscape.

Fall colors, stunted evergreens, and barren alpine mountains of South Central Alaska.

Fall colors, stunted evergreens, and barren alpine mountains of South Central Alaska.

Grande Denali Lodge overlooking Denali Canyon.

A braided river and snow-covered mountains highlighted by fall colors.

Mountains, a glacier, and fall colors.

Mountains, valley and river in the fall.

Looking towards a glacier with its braided outwash stream below.

Fall foliage, a river bridge below and a highway leading into a seemingly endless wilderness.

Triangles in nature with fall foliage and evergreens.

Tlingit Indian canoe in the sunset