Vast sunset view overlooking huge saguaro cactus "forests" from atop Signal Hill. Saguaro National Park, Arizona.

Vast sunset view overlooking huge saguaro cactus "forests" from atop Signal Hill. Saguaro National Park, Arizona.

Sunset brilliance in the Sonoran Desert behind a saguaro cactus forest. Saguaro National Park, Arizona.

Sunset brilliance in the Sonoran Desert behind saguaro cactus. Saguaro National Park, Arizona.

Huge saguaro cactus next to a dead saguaro cactus skeleton at sunset. Saguaro National Park, Arizona.

Petroglyphs atop Signal Hill at sunset overlooking vast desert of saguaro cacti. Saguaro National Park, Arizona.

Petroglyphs atop Signal Hill at sunset overlooking vast desert of saguaro cacti. Saguaro National Park, Arizona.

Sunset brilliance in the Sonoran Desert behind a single saguaro cactus. Saguaro National Park, Arizona.

Sunset brilliance in the Sonoran Desert behind a single saguaro cactus. Saguaro National Park, Arizona.

Sunrise over Wilson Creek, Washington.

Gray rabbitbrush overlooking Umtanum Creek Canyon. L.T. Murray Wildlife Area, Washington.

Western Rattlesnake moving across old jeep track. Douglas Creek Canyon, Washington.

Sandstone column formation along the Hanford Reach. Wahluke Slope Wildlife Area, Hanford Reach, Washington.

Views down Swakane Canyon. Swakane Wildlife Area, Washington.

Dramatic views down the Palouse River Canyon below Palouse Falls. Palouse Falls State Park, Washington.

Sand dunes for exploring at the White Bluffs along the Hanford Reach. Wahluke Slope Wildlife Area, Washington.

A hiker roams alone along the sand dunes of the White Bluffs along the Hanford Reach. Wahluke Slope Wildlife Area, Washington.

Big sky and stunning views of the last free-flowing stretch of the Columbia River at the White Bluffs along the Hanford Reach. Wahluke Slope Wildlife

Big sky and stunning views of the last free-flowing stretch of the Columbia River at the White Bluffs along the Hanford Reach. Wahluke Slope Wildlife

Sand dunes for exploring at the White Bluffs along the Hanford Reach. Wahluke Slope Wildlife Area, Washington.

Sand dunes and views toward Saddle Mountain at the White Bluffs along the Hanford Reach. Wahluke Slope Wildlife Area, Washington.

Sand dunes and views toward Saddle Mountain at the White Bluffs. Hanford Reach, Washington.

Frosty sage overlooking a desert lake. Lakeview Ranch BLM land near Odessa, Washington.

Sage and rabbitbrush along the shores of flooded Trail Lake Coulee in winter. Near Coulee City in Grand Coulee Country, Washington.

Cattail reeds in a creek with basalt cliffs above Dusty Lake. Quincy Lake Wildlife Area, Washington.

Gray rabbitbrush with a frosty sunrise on the basalt cliffs of Moses Coulee, Washington.

Cattail reeds in a creek with basalt cliffs above Dusty Lake. Quincy Lake Wildlife Area, Washington.

Sunset across Washtucna Coulee near Kahlotus, Washington.

Sunset across Washtucna Coulee near Kahlotus, Washington.

Wild Horses Monument. Vantage, Washington.

Low water levels on the Columbia River expose mud-flats and rocks. Priest Rapids Wildlife Area, Washington.

Low water levels on the Columbia River expose mud-flats and rocks. Priest Rapids Wildlife Area, Washington.

Looking at Wanapum Breaks from the Priest Rapids Wildlife Area, Washington.

Early morning winter light on coulee lake; Odessa Coulee, Washington

Vast views, big sky, and the Hanford Reach stretch of the Columbia River. Wahluke Slope Wildlife Area, Eastern Washington.

Inlet waterfall at Ancient Lake. Quincey Wildlife Area, Washington.

Sunrise on Park Lake area coulee. Grand Coulee, Washington.

Fascinating canyon cliff walls along Joseph Creek. Grand Ronde River Canyon, Washington.

Early spring views up Northrup Canyon heading up out of Grand Coulee. Steamboat Rock State Park, Washington.

Four grass clumps in a calm Quincy Lake. Quincy Wildlife Area, Washington.

Frosty sage overlooking Chukar Lake. Columbia National Wildlife Refuge, Washington.

Sunrise highlights the brightness of winter-time gray rabbitbrush plants with Umtanum Ridge in the distance. Oak Creek Wildlife Area, Washington.

A lone hiker climbs his way to the top of a large sand dune along the Hanford Reach. Wahluke Slope Wildlife Area, Washington.

Winter sunrise brightens frozen hoar frost on the sage. Columbia National Wildlife Refuge, Washington.

The rolling ridges of Umtanum Ridge. L.T. Murray Wildlife Area, Washington.

Spring greening views of flowers in the desert. Horsethief Butte State Park, Washington.

Pre-dawn sunrise light overlooking Alkali Lake. Grand Coulee, Washington.

The moment of sunrise overlooking Dry Falls. Grand Coulee, Washington.

Sunrise highlighting rolling hills of looking into Oregon from across the Columbia River Gorge. Columbia Hills Nature Preserve, Washington.