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Leaving base camp, climbing expedition on Mount McKinley, 6194m, Denali National Park, Alaska, United States of America, North America
Climbing expedition on Mount McKinley, 6194m, Denali National Park, Alaska, United States of America, North America
Climbing expedition on Mount McKinley, 6194m, Denali National Park, Alaska, United States of America, North America
Western salsify (goatsbeard) (Tragopogon dubius) seedhead, Glacier National Park, Montana, United States of America, North America
Dwarf lupine (small lupine) (rusty lupine) (Lupinus pusillus), The Needles District, Canyonlands National Park, Utah, United States of America, North America
Fremont's peppergrass (Lepidium fremontii) behind a weathered juniper trunk, Arches National Park, Utah, United States of America, North America
Desert Cottontail (Sylvilagus auduboni), Wind Cave National Park, South Dakota, United States of America, North America
Wild Chives (Allium schoenoprasum), Glacier National Park, Montana, United States of America, North America
Governors Island, Queen Mary 2, Park National Historic Landmark District, New York City, New York Harbor, United States of America, North America
Grand Canyon, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America (U.S.A.), North America
Russian Bishop's House, built 1843 in Sitka spruce, Sitka National Historical Park sign, rare sunny day, Southeast Alaska, United States of America, North America
Killer whale (orca) pod (Orcinus orca), Resurrection Bay, Kenai Fjords National Park, Alaska, United States of America, North America
Aerial view over the Cliff Palace crowded, with tourists, in the Mesa Verde National Park, UNESCO World Heritage Site, Colorado, United States of America, North America
Bayou in swampland at Jean Lafitte National Historic Park and Preserve, south of New Orleans, Louisiana, United States of America (U.S.A.), North America
Lava flow, Kilauea, Hawaii Volcanoes National Park, UNESCO World Heritage Site, Island of Hawaii (Big Island), Hawaii, United States of America, North America
Fort Jefferson, Dry Tortugas National Park, Florida, United States of America, North America
Climbing expedition on Mount McKinley, 6194m, Denali National Park, Alaska, United States of America, North America
Detail of a rough mulesears (Wyethia scabra) bloom, Arches National Park, Utah, United States of America, North America
Trees in fall colours in woods in the Acadia National Park, Maine, New England, United States of America, North America
Midway Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America
Beaver Pond and Dam with Teton Range, Grand Tetons National Park, Wyoming, United States of America, North America
Giant sequoia trees in the Giant Forest in the Sequoia National Park, California, United States of America, North America
Aerial view over woodland and rolling hills in fall colours, White Mountain National Park, New Hampshire, New England, United States of America, North America
St. Mary Lake and Wild Goose Island, Glacier National Park, Rocky Mountains, Montana, United States of America (USA), North America
Castle Geyser, Upper Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America (U.S.A.), North America
Upper and Lower Yosemite Falls, swollen by summer snowmelt, Yosemite National Park, UNESCO World Heritage Site, California, United States of America
Skylight, view through cooled lava to molten lava below, Kilauea Volcano, Hawaii Volcanoes National Park, Island of Hawaii (Big Island', Hawaii, United States of America, North America
Castle Geyser, Upper Geyser Basin, Yellowstone National park, Wyoming, USA
Tropical beach, Fort Jefferson, Dry Tortugas National Park, Florida, United States of America, North America
Climbing expedition on Mount McKinley, 6194m, Denali National Park, Alaska, United States of America, North America
Commanding Officer's Quarters, Governors Island, Park, National Historic Landmark District, New York City, New York Harbor, United States of America, North America
Fly fisherman casting in the early morning fog in the Madison River, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America
View east from Logan Pass, Glacier National Park, Montana, United States of America (U.S.A.), North America
Lake of the Clouds, Carlsbad Caverns National Park, UNESCO World Heritage Site, New Mexico, United States of America, North America
Lower Falls of Yellowstone River, 94m high at head of canyon, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America (U.S.A.), North America
Second Beach, Olympic National Park, UNESCO World Heritage Site, Washington state, United States of America, North America
Rocks in the South Fork of the Kings River, with trees and crags in the background, in Cedar Gorge, Kings Canyon National Park, California, United States of America, North America
Close-up of the limestone terraces formed by volcanic water depositing six inches of calcium carbonate a year, Mammoth Hot Springs and Terraces, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America
Saguaro cactus (Cereus giganteus), Saguaro National Park (West), Tucson, Arizona, United States of America, North America
Second Beach, Olympic National Park, UNESCO World Heritage Site, Washington state, United States of America, North America
Steam plumes from hot lava flowing onto beach and into the ocean, Kilauea Volcano, Hawaii Volcanoes National Park, UNESCO World Heritage Site, Island of Hawaii (Big Island), Hawaii, United States of America, North America
The Racetrack Point, Death Valley National Park, California, United States of America, North America
Rare winter snowfall, Joshua Tree National Park, California, United States of America, North America
Reflections in Snake River, Grand Tetons National Park, Wyoming, United States of America, North America
Lighthouse, Fort Jefferson, Dry Tortugas National Park, Florida, United States of America, North America
Old cottage with colourful foliage in the Indian summer, Great Smoky National Park, Tennessee, United States of America, North America
Hikers on arch rock formation in Bryce Canyon Amphitheater, Bryce Canyon National Park, Utah, United States of America, North America
Redoubt Mountain Lodge on Crescent Lake, Lake Clark National Park and Preserve, Alaska, United States of America, North America
Hot lava flowing onto beach and into the ocean, Kilauea Volcano, Hawaii Volcanoes National Park, UNESCO World Heritage Site, Island of Hawaii (Big Island), Hawaii, United States of America, North America
Lighthouse, Fort Jefferson, Dry Tortugas National Park, Florida, United States of America, North America
Hikers on arch rock formation in Bryce Canyon Amphitheater, Bryce Canyon National Park, Utah, United States of America, North America
Sagamore Hill, home of President Theodore Roosevelt, National Park, Oyster Bay, Long Island, New York, United States of America, North America
The town of Medora in the Roosevelt National Park, North Dakota, United States of America, North America
East entrance, Zion National Park, Utah, United States of America, North America
Frosted sagebrush at dawn, Grand Teton National Park, Wyoming, United States of America, North America
Ignimbrite exposed in river canyons cut since 1912 eruption, in the Valley of Ten Thousand Smokes, in Katmai Volcano National Park, Alaska, United States of America, North America
Meadow of glacier lilies, with the High Rocky Mountains behind, Glacier National Park, Montana, United States of America, North America
Castle and Sawmill Geysers in eruption in Old Faithful Geyser Basin in winter, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America (U.S.A.), North America
Winter eruption, Old Faithful geyser, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America
Grand Canyon, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America
Male sagebrush lizard (Sceloporus graciosus) looking at camera, Canyonlands National Park, Utah, United States of America, North America
Eruption of Castle Geyser with thermophilic bacterica mats in foreground, Upper Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America
Fort Jefferson, Dry Tortugas National Park, Florida, United States of America, North America
Governors Island, Park, National Historic Landmark Dstrict, New York City, New York Harbor, United States of America, North America
English Camp, San Juan Island National Historical Park, San Juan Islands, Washington state, United States of America, North America
Gullies eroded into the Pierre shales below Loop Road, Sage Creek wilderness, Badlands National Park, South Dakota, United States of America, North America
Hoodoos, Bryce amphitheater, Bryce Canyon National Park, Utah, United States of America (U.S.A.), North America
Scotty's Castle, a major attraction and historic home in Death Valley National Park, California, United States of America, North America
Old North Bridge, Minute Man National Historic Park, Concord, Massachusetts, United States of America, North America
Camp 2, climbing expedition on Mount McKinley, 6194m, Denali National Park, Alaska, United States of America, North America
Lavender evening-primrose (Calyophus lavandulifolia), The Needles District, Canyonlands National Park, Utah, United States of America, North America
Wooden seat on the rim of the Amphitheatre, in the Bryce Canyon National Park, Utah, United States of America, North America
The Snake River cutting through terrace 2000m below summits, Grand Teton National Park, Wyoming, USA, North America
Blisters measuring about 10 cm across in boiling mud pool, Mud volcano, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America (U.S.A.), North America
Hot water in pools on calcite terraces deposited by Mammoth Hot Springs, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America (U.S.A.), North America
Pueblo ruins in Mesa Verde containing some of the most elaborte Pueblo dwellings found today, Mesa Verde National Park, UNESCO World Heritage Site, Colorado, United States of America, North America
Petroglyph Rock Art in Capitol Reef National Park, Utah, United States of America, North America
Mountain harebell (Campanula lasiocarpa), Glacier National Park, Montana, United States of America, North America
Dwarf evening-primrose (tufted evening-primrose) (white tufted evening-primrose ) (morning-lily) (handkerchief plant) (Oenothera caespitosa), Arches National Park, Utah, United States of America, North America
Salt pan polygons at Badwater Basin, 282ft below sea level and the lowest place in North America, Death Valley National Park, California, United States of America, North America
Carlsbad Caverns, Carlsbad Caverns National Park, UNESCO World Heritage Site, New Mexico, United States of America, North America
Cake Rock on Rialto Beach, Olympic National Park, UNESCO World Heritage Site, Washington State, United States of America, North America
Balanced Rock, a pinnacle of red sandstone caused by erosion, in the Arches National Park in Utah, United States of America, North America
Old wooden barn on farmstead in the old pioneer community at Cades Cove, Great Smoky Mountains National Park, Tennessee, United States of America, North America
Echinus Geyser, erupts every hour in Norris Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America (U.S.A.), North America
Geothermal steam from geyser vent between eruptions, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America (U.S.A.), North America
The Racetrack Point, Death Valley National Park, California, United States of America, North America
Artist's Palette, Artist's Drive, Death Valley National Park, California, United States of America, North America
Fort Jefferson, Dry Tortugas National Park, Florida, United States of America, North America
Tourists having a picnic, Shenandoah National Park, Virginia, United States of America, North America
Sand dunes in the Great Sand Dunes National Park and Preserve with Sangre Cristo Mountains in the background, Colorado, United States of America, North America
Mountain harebell (Campanula lasiocarpa) with frost, Glacier National Park, Montana, United States of America, North America
Snow on pinnacles and rock formations in the Bryce Canyon National Park in Utah, United States of America, North America
Bison, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America
Steam plumes from hot lava flowing onto the beach and hitting the ocean, Kilauea Volcano, Hawaii Volcanoes National Park, UNESCO World Heritage Site, Island of Hawaii ('Big Island'), Hawaii, United States of America, North America
Big Bend National Park, Texas, United States of America, North America
Zabriskie Point, Death Valley National Park, California, United States of America, North America
Crowds of spectators watching Old Faithful Geyser erupting, Upper Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America
Bison walk through winter storm, Yellowstone National Park, UNESCO World Heritage Site, Montana, United States of America, North America
The town of Medora in the Roosevelt National Park, North Dakota, United States of America, North America