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View of National Gallery of Art, East Building on the National Mall in spring, Washington D.C., 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

Petroglyph National Monument, petroglyphs carved into volcanic rock by American Indians 400 to 700 years ago, New Mexico, United States of America, 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

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

Governors Island, Queen Mary 2, Park National Historic Landmark District, New York City, New York Harbor, United States of America, North America

Cliff Palace, Mesa Verde National Park, UNESCO World Heritage Site, Colorado, United States of America, North America

Yellow flowering plants and loop road seen from Inferno cone, Craters of the Moon National Monument, Idaho, United States of America (U.S.A.), North America

View of city skyscrapers from Millenium Park, Downtown Chicago, Illinois, United States of America, North America

Second Beach, Olympic National Park, UNESCO World Heritage Site, Washington state, 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

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

Looking behind the 10th green at Augusta National Golf Club during the US Masters, Augusta, Georgia, United States of America, North America

The National Museum of African American History and Culture in spring, Washington D.C., United States of America, North America

Kivas, Pueblo Bonito dated at 1000-1100 AD, Anasazi site, Chaco Canyon National Monument, New Mexico, United States of America (U.S.A.), North America

Grand Canyon, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Petroglyph National Monument, petroglyphs carved into volcanic rock by American Indians 400 to 700 years ago, New Mexico, 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

East Building, National Gallery of Art, Washington D.C., United States of America (U.S.A.), North America

Redoubt Mountain Lodge on Crescent Lake, Lake Clark National Park and Preserve, Alaska, United States of America, North America

Tropical beach, 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

Petroglyph National Monument, petroglyphs carved into volcanic rock by American Indians 400 to 700 years ago, New Mexico, United States of America, North America

View east from Logan Pass, Glacier National Park, Montana, United States of America (U.S.A.), North America

Thousands of trees blown down by the 1980 eruption still floating on Spirit Lake north of the mountain, Mount St. Helens National Volcanic Monument, Washington State, United States of America (U.S.A.), 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

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

Fremont's peppergrass (Lepidium fremontii) behind a weathered juniper trunk, Arches National Park, Utah, United States of America, North America

Second Beach, Olympic National Park, UNESCO World Heritage Site, Washington state, 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

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

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

Great Blue Heron, Everglades National Park, UNESCO World Heritage Site, Florida, United States of America, North America

Lindblad National Geographic guests enjoy a Zodiac tour at Dawes Glacier, Southeast Alaska, United States of America, North America

Lindblad National Geographic guests enjoy a Zodiac tour at Dawes Glacier, Southeast Alaska, United States of America, North America

Hoodoos, Bryce amphitheater, Bryce Canyon National Park, Utah, United States of America (U.S.A.), 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

Saguaro cactus (Cereus giganteus), Saguaro National Park (West), Tucson, Arizona, United States of America, North America

Geysers in Yellowstone National Park, UNESCO World Heritage Site, Montana, United States of America, North America

Stedman-Thomas National Historic District, beautiful summer evening, Ketchikan, Southern Panhandle, Southeast Alaska, United States of America, North America

Galena summit view with sign, Sawtooth National Recreation Area, Idaho, United States of America (U.S.A.), North America

Badlands from Zabriskie Point, looking west, Death Valley National Monument, California, United States of America (U.S.A.), North America

Swamps, Everglades National Park, UNESCO World Heritage Site, Florida, United States of America, North America

Rio Grande River, Santa Elena Canyon, Big Bend National Park, Texas, United States of America, North America

Small plane landed on glacier in Denali National Park, Alaska, United States of America, 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

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

Turret Arch through North Window at sunrise, Arches National Park, Moab, Utah, United States of America, North America

The National Museum of American History in spring, Washington D.C., United States of America, North America

Terraces, Mammoth Hot Springs, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America (USA), North America

View from the Rim, Grand Canyon of the Yellowstone River, 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

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

Lindblad National Geographic guests enjoying sunset at Chichagof Island, southeast Alaska, United States of America, North America

Anhinga trail, Everglades National Park, UNESCO World Heritage Site, Florida, United States of America (U.S.A.), North America

Travertine calcite deposits, Minerva Terrace, Mammoth Hot Springs and Terraces, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America (U.S.A.), North America

Snowmobiling in the western area of Yellowstone National Park, UNESCO World Heritage Site, Montana, United States of America, North America

Yellowstone Canyon, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

American Wigeon (American Widgeon) (Baldpate) (Anas americana) hen, Rio Grande Zoo, Albuquerque Biological Park, Albuquerque, New Mexico, United States of America, North America

The Stars & Stripes in front of the Heritage Centre, White Mountain National Park, New Hampshire, New England, United States of America, North America

Wild flowers, Jackson Lake, Grand Teton National Park, Wyoming, United States of America (USA), North America

Morning Glory spring, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, 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

Angel's Landing and Virgin River, Zion National Park, Utah, United States of America (USA), North America

Yellowstone Canyon, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Cannon battery at Historic Fort Sumter National Monument, Charleston, South Carolina, United States of America, North America

Sunrise, Yellowstone Lake, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America (USA), North America

Cottonwood trees on the banks of the Virgin River, Zion National Park, Utah, United States of America, North America

Midway Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America (U.S.A.), North America

Late afternoon, Yovimpa Point, Bryce Canyon National Park, Utah, United States of America, North America

Geyser, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

North American black bear crossing road, Yellowstone National Park, Wyoming, United States of America, North America

Minerva Spring, Mammoth Hot Springs, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America (USA), North America

Part of the North Unit of Badlands National Park, South Dakota, United States of America, North America

Blue Mesa, Petrified Forest National Park, Arizona, United States of America (U.S.A.), North America

Path between crater cones inside Haleakala volcano crater, Haleakala National Park, island of Maui, Hawaii, United States of America, Pacific

Egret, Everglades National Park, UNESCO World Heritage Site, Florida, United States of America, North America

Yellowstone Canyon, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Steam from hot springs and snow-free hot ground in Midway Basin in winter, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America (U.S.A.), North America