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Aspen trees in fall colors on Elk Mountains, Capitol Creek trailhead, Colorado
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Bald Cypress at upper Blue Basin, Reelfoot National Wildlife Refuge, Tennessee
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Beach near San Simeon Creek with ice plant in the foreground, Big Sur, California
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Birch forest, Pictured Rocks National Lakeshore, Michigan
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Bixby Bridge, Big Sur, California
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California Poppy and Desert Bluebells carpeting a spring hillside, California
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Cascades at Emerald Pools, Zion National Park, Utah
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Cascades at Emerald Pools, Zion National Park, Utah
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Cathedral Rock reflected in Oak Creek, Red Rock State Park near Sedona, Arizona
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Cedar Creek flowing through deciduous forest, Petit Jean State Park, Arkansas
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Cinder Cones and Joshua Trees, Mojave National Preserve, California
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Claret Cup Cactus and Verbena, detail of flowers in bloom, North America
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Cloud over White Sands National Monument, Chihuahuan Desert, New Mexico
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Cottonwood (Populus sp) trees, fall foliage, Carson Valley, Nevada
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Cottonwood trees and Willows, Bosque del Apache National Wildlife Refuge, New Mexico
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Court of the Patriarchs rising above river, Zion National Park, Utah
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Crescent moon over El Matador Beach, Malibu, California
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Devil's Garden sandstone formations, Escalante National Monument, Utah
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Dream Lake, Rocky Mountain National Park, Colorado
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Elephant Rock, a unique sandstone formation, Valley of Fire State Park, Nevada
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Firehole river, Yellowstone National Park, Wyoming
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Fremont Cottonwood tree, White Sands National Monument, Chihuahuan Desert New Mexico
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Full moon over Mono Lake with tufa towers and Sierra Nevada Mountains, California
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Geissler Mountain reflected in Linkins Lake, Colorado
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Gothic Mountain and Beaver Lodge, near Crested Butte, Colorado
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Grand Canyon, Grand Canyon National Park, Arizona
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Gunnison National Forest in fall, Colorado
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Gypsum dunes, Guadalupe Mountains National Park, Texas
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Hot Creek at sunset, eastern Sierra Nevada, California
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Ice on the Colorado River beneath sandstone cliffs, Cataract Canyon, Utah
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La Sal Mountains and Globemallows, Salt Valley, Arches National Park, Utah
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Laurel Mountain and Convict Lake, eastern Sierra Nevada, California
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Little Missouri River, Theodore Roosevelt National Park, North Dakota
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Lone pine tree with East and West Temples in the background, Zion National Park, Utah
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Lower Yellowstone Falls and Grand Canyon of Yellowstone National Park, Wyoming
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Lower Yellowstone Falls, Yellowstone National Park, Wyoming
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Lunch Creek Cascades, Glacier National Park, Montana
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Boulder and deciduous forest, Cades Cove, Great Smoky Mountains National Park, Tennessee
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Camel Butte rising from the desert floor, Monument Valley, Arizona
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Chisos Agave (Agave havardiana) and the Chisos Mountains, Big Bend National Park, Texas
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Dolomite Peak and Bow River backwaters, Banff National Park, Alberta
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Field of sunflowers, Flint Hills National Wildlife Refuge, Kansas
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Full moon over boulders at El Pescador State Beach, Malibu, California
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Geissler Mountain and Linkins Lake, Colorado
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Mammoth Peak, Upper Dana Meadow, Yosemite National Park, California
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Maroon Bells and Maroon Creek in autumn, Colorado
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Marsh, Padre Island National Seashore, Texas
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Memorial Point, Lake Tahoe, Nevada