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The Merced River swollen by summer snowmelt, with the Yosemite Falls in the background, in the Yosemite National Park, UNESCO World Heritage Site, California, United States of America, North America
Rock formations caused by erosion, and a solitary pine tree above the Queens Garden, in the Bryce Canyon National Park, in Utah, United States of America, North America
Sign at south entrance to the Park, trees in fall colours, and the Mountain of the Sun and the Twin Brothers peaks, in the Zion National Park, Utah, United States of America, North America
Solitary ponderosa pine on top of a sandstone outcrop in the Zion National Park, in Utah, United States of America, North America
Viewing walkway, Everglades National Park, Florida, United States of America, North America
Beauty Pool in Upper Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America (U.S.A.), North America
Mount McKinley, at 20320 feet the highest peak in North America, Denali National Park, Alaska, United States of America (U.S.A.), North America
View from the Alum Cave Bluffs trail in Great Smoky Mountains National Park, UNESCO World Heritage Site, Tennessee, United States of America (U.S.A.), North America
Snowline on Alaska Range, Denali National Park, Alaska, United States of America, North America
Part of the North Unit of Badlands National Park, carved out of the prairies by rapid water erosion of sediments, South Dakota, United States of America, North America
Bryce Canyon National Park, Utah, United States of America, North America
Tunnel Log, 275 ft long, which fell in 1937, Sequoiadendron giganteum, Sequoia National Park, California, United States of America, North America
Coastline, Acadia National Park, Maine, New England, United States of America (U.S.A.), North America
Coastal brown bear, Ursus arctos, Lake Clark National Park, Alaska, United States of America, North America
Atlantic Coastline, Acadia National Park, Mount Desert Island, Maine, New England, United States of America, North America
Tourists inspecting the large halite salt crystal formations, Devils Golf Course, Death Valley National Park, California, United States of America, North America
Skylight, view through cooled lava to molten lava below, with plumes of steam as lava reaches the sea beyond, 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
Joshua tree, Jumbo Rocks area, Joshua Tree National Park, California, United States of America, North America
Early morning light on corrugated badlands landscape at Zabriskie Point, Death Valley National Park, California, United States of America, North America
Grizzly bear (Ursus Arctos), Brooks Falls, Katmai National Park, Alaska, United States of America, North America
Aspen trees in autumn colours, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America
Carlsbad Caverns, Carlsbad Caverns National Park, UNESCO World Heritage Site, New Mexico, United States of America, North America
Haleakala National Park, volcanic landscape and summit visitors center, Maui Island, Hawaii, United States of America, North America
Person snorkelling near tropical beach, Dry Tortugas National Park, Florida, United States of America, North America
Passageway, Fort Jefferson, Dry Tortugas National Park, Florida, United States of America, North America
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
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
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
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
A visitors centre in wetlands, Everglades National Park, Florida, United States of America, North America
Farmstead in the old pioneer community at Cades Cove, Great Smoky Mountains National Park, UNESCO World Heritage Site, Appalachians, Tennessee, United States of America (U.S.A.), North America
Plumes of steam where the lava reaches the sea, Kilauea Volcano, Hawaii Volcanoes National Park, UNESCO World Heritage Site, Island of Hawaii (Big Island), Hawaii, United States of America, Pacific, North America
Climbing expedition on Mount McKinley, 6194m, Denali National Park, Alaska, United States of America, North America
The Morning Glory Pool, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America
The Morning Glory Pool, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America
Area near Loft Mountain, Shenandoah National Park, Virginia, United States of America (U.S.A.), North America
Upper Yosemite Falls cascades down the sheer granite walls of Yosemite Valley, the world's longest unbroken fall, with the famous 8842 ft Half Dome in the distance, Yosemite National Park, UNESCO World Heritage Site, California, United States of America (U.S.A.), North America
Climbing expedition on Mount McKinley, 6194m, Denali National Park, Alaska, 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
Wild Chives (Allium schoenoprasum), Glacier National Park, Montana, United States of America, North America
Cliff Palace, Mesa Verde National Park, UNESCO World Heritage Site, Colorado, United States of America, North America
Desert Cottontail (Sylvilagus auduboni), Wind Cave National Park, South Dakota, 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
Cooled lava from recent eruption, Kilauea Volcano, Hawaii Volcanoes National Park, UNESCO World Heritage Site, Island of Hawaii (Big Island), Hawaii, United States of America, North America
Alaskan brown bear (grizzly), grazing on tundra berries, Denali National Park, Alaska, United States of America, North America
Midway Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, 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
Tourists dwarfed by the General Sherman Sequoia Tree, largest in the world by volume, Sequoia National Park, California, 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
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
Mountain stream beside Going to the Sun road, near Logan Pass, Glacier National Park, Montana, United States of America, North America
Elk (Cervus canadensis) with tourists along the Madison River, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America
Detail of a rough mulesears (Wyethia scabra) bloom, Arches National Park, Utah, 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
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
Plumes of steam where the lava reaches the sea, Kilauea Volcano, Hawaii Volcanoes National Park, UNESCO World Heritage Site, Island of Hawaii (Big Island), Hawaii, United States of America, Pacific, North America
Bighorn sheep (Ovis canadensis) ram in the snow, Yellowstone National Park, Wyoming, 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
Hikers on arch rock formation in Bryce Canyon Amphitheater, Bryce Canyon National Park, Utah, 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
Second Beach, Olympic National Park, UNESCO World Heritage Site, Washington state, 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
Lake of the Clouds, Carlsbad Caverns National Park, UNESCO World Heritage Site, New Mexico, United States of America, 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
Tropical beach, Fort Jefferson, Dry Tortugas National Park, Florida, 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
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
Grand Canyon, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, 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
Rare winter snowfall, Joshua Tree National Park, California, United States of America, North America
Lighthouse, 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
Frosted sagebrush at dawn, Grand Teton National Park, Wyoming, United States of America, North America
Hills near Loft Mountain in autumn in the Shenandoah National Park, Virginia, 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
Gullies eroded into the Pierre shales below Loop Road, Sage Creek wilderness, Badlands National Park, South Dakota, United States of America, North America
Saguaro cactus (Cereus giganteus), Saguaro National Park (West), Tucson, Arizona, United States of America, North America
Male sagebrush lizard (Sceloporus graciosus) looking at camera, Canyonlands National Park, Utah, United States of America, North America
Petroglyph Rock Art in Capitol Reef National Park, Utah, United States of America, North America
Reflections in Snake River, Grand Tetons National Park, Wyoming, United States of America, North America
Fort Jefferson, Dry Tortugas National Park, Florida, 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
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
Fossil logs 200 million years old scattered over desert floor in National Park, Petrified Forest National Park, Arizona, United States of America (U.S.A.), North America
View east from Logan Pass, Glacier National Park, Montana, United States of America (U.S.A.), North America
Cooled lava from recent eruption, Kilauea Volcano, Hawaii Volcanoes National Park, UNESCO World Heritage Site, Island of Hawaii (Big Island), Hawaii, United States of America, North America
Scotty's Castle, a major attraction and historic home in Death Valley National Park, California, United States of America, North America
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
Sagamore Hill, home of President Theodore Roosevelt, National Park, Oyster Bay, Long Island, New York, United States of America, North America