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Gray wolf (Canis lupus) on a rock, howling, in captivity, Sandstone, Minnesota, United States of America, North America

Niagara Falls on the Niagara River that connects Lakes Ontario and Erie, American Falls on the left, and Horseshoe Falls on the right, New York State, United States of America (U.S.A.), North America

Visitor looking over rugged landscape from the Badlands Loop Road near Panorama Point, Badlands National Park, South Dakota, United States of America, North America

Paper doll cutouts, Formative Period Petroglyphs, Utah Scenic Byway 279, Potash Road, Rock Art Sites, Moab, 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 across Nymph Lake at sunrise, with Hallett Peak above the trees, Rocky Mountain National Park, Colorado, United States of America, North America

Rock formation known as Swirls on Colorado Plateau, Arizona, United States of America (U.S.A.), North America

Pillar of stone in Thin Lizy Canyon, a slot canyon, Arizona, United States of America (U.S.A.), North America

West Rim, Grand Canyon, UNESCO World Heritage Site, Arizona, United States of America (U.S.A.), North America

View of active volcano from helicopter, Big Island, Hawaii, Hawaiian Islands, United States of America (U.S.A.), North America

Father and son hike to Anderson Pass, Enchanted Valley, Olympic National Park, UNESCO World Heritage Site, Washington State, United States of America (U.S.A.), North America

Dry Fork Canyon Rock Art, located on McConkie Ranch, Fremont style, dating from AD 700 to AD 1200, near Vernal, Utah, United States of America, North America

Dry Fork Canyon Rock Art, located on McConkie Ranch, Fremont style, dating from AD 700 to AD 1200, near Vernal, Utah, United States of America, North America

Dry Fork Canyon Rock Art, located on McConkie Ranch, Fremont style, dating from AD 700 to AD 1200, near Vernal, Utah, United States of America, North America

Dry Fork Canyon Rock Art, located on McConkie Ranch, Fremont style, dating from AD 700 to AD 1200, near Vernal, Utah, United States of America, North America

Dry Fork Canyon Rock Art, located on McConkie Ranch, Fremont style, dating from AD 700 to AD 1200, near Vernal, Utah, United States of America, North America

Dry Fork Canyon Rock Art, located on McConkie Ranch, Fremont style, dating from AD 700 to AD 1200, near Vernal, Utah, United States of America, North America

Dry Fork Canyon Rock Art, located on McConkie Ranch, Fremont style, dating from AD 700 to AD 1200, near Vernal, Utah, United States of America, North America

Dry Fork Canyon Rock Art, located on McConkie Ranch, Fremont style, dating from AD 700 to AD 1200, near Vernal, Utah, United States of America, North America

Dry Fork Canyon Rock Art, located on McConkie Ranch, Fremont style, dating from AD 700 to AD 1200, near Vernal, Utah, United States of America, North America

Rock Art, Fremont style anthropomorphs dating from AD 500 to 1300, Capitol Reef National Park, Utah, United States of America, North America

Mount Rushmore National Monument, Black Hills, South Dakota, United States of America, North America

Buckhorn Wash Rock Art Panel, Barrier Canyon Style, dating from 2000 BC to 1 AD, San Rafael Swell, Utah, United States of America, North America

Buckhorn Wash Rock Art Panel, Barrier Canyon Style, dating from 2000 BC to 1 AD, San Rafael Swell, Utah, United States of America, North America

Buckhorn Wash Rock Art Panel, Barrier Canyon Style, dating from 2000 BC to 1 AD, San Rafael Swell, Utah, United States of America, North America

Buckhorn Wash Rock Art Panel, Barrier Canyon Style, dating from 2000 BC to 1 AD, San Rafael Swell, Utah, United States of America, North America

Buckhorn Wash Rock Art Panel, Barrier Canyon Style, dating from 2000 BC to 1 AD, San Rafael Swell, Utah, United States of America, North America

Sego Canyon Rock Art Panal, Barrier Canyon style pictographs, near Thompson, Utah, United States of America, North America

Sego Canyon Rock Art Panal, Barrier Canyon style pictographs, near Thompson, Utah, United States of America, North America

Sego Canyon Rock Art Panal, Barrier Canyon style pictographs, near Thompson, Utah, United States of America, North America

Prospect Harbour Point Light, lighthouse at Lubec, Maine, New England, United States of America, North America

Backpackers in steamy light, Queets Vall, Olympic National Park, UNESCO World Heritage Site, Washington State, United States of America (U.S.A.), North America

Windsurfing at Kahului Beach, Maui, Hawaii, Hawaiian Islands, Pacific Ocean, United States of America (U.S.A.), North America

View of Courthouse Towers, The Organ and Three Gossips at dawn, Arches National Park, Utah, United States of America, North America

The Mittens and Merrick Butte, Monument Valley Navajo Tribal Park, Utah, United States of America, North America

Pinnacles and hoodoos with fog extending into clouds of a partial temperature inversion, Bryce Canyon National Park, Utah, United States of America, North America

Fog and clouds of a partial temperature inversion surround the red rocks of Bryce Canyon, Bryce Canyon National Park, Utah, United States of America, North America

Cliff dwellings constructed over 700 years ago, Gila Cliff Dwellings National Monument, New Mexico, United States of America, North America

Cliff dwellings constructed over 700 years ago, Gila Cliff Dwellings National Monument, New Mexico, United States of America, North America

Cliff dwellings constructed over 700 years ago, Gila Cliff Dwellings National Monument, New Mexico, United States of America, North America

Cliff dwellings constructed over 700 years ago, Gila Cliff Dwellings National Monument, New Mexico, United States of America, North America

Cliff dwellings constructed over 700 years ago, Gila Cliff Dwellings National Monument, New Mexico, United States of America, North America

Cliff dwellings constructed over 700 years ago, Gila Cliff Dwellings National Monument, New Mexico, United States of America, North America

Cliff dwellings constructed over 700 years ago, Gila Cliff Dwellings National Monument, New Mexico, United States of America, North America

Backlit hoodoos and Thor's Hammer, Bryce Canyon National Park, Utah, United States of America, North America

View from Sunset Point at sunset, Bryce Canyon National Park, Utah, United States of America, North America

Visitor at Painted Wall View Point, Gunnison River deep in the canyon, Black Canyon of the Gunnison National Park, Colorado, United States of America, North America

Stream through wildflowers, Mineral Basin, Uncompahgre National Forest, Colorado, United States of America, North America

Escarpment and lava beds in El Malpais National Monument, New Mexico, United States of America, North America

Layered sandstone column under clouds, Coyote Buttes Wilderness, Vermillion Cliffs National Monument, Arizona, United States of America, North America

Rock Art, Anthropomorph images, 600AD to 1250AD, Sego Canyon, Southern Utah, United States of America, North America

Lomaki Pueblo, inhabited from approximately 1100 AD to 1250 AD, Wupatki National Monument, Arizona, United States of America, North America

Group of people hold hands at the summit of Nohoch Mul Pyramid in the Ancient Mayan City of Coba, outside Tulum, Mexico, North America

Glacial ice calved from the Sawyer Glacier, Williams Cove, Tracy Arm-Ford's Terror Wilderness Area, Southeast Alaska, United States of America, North America

Snow-melt waterfall in Tracy Arm-Ford's Terror Wilderness area, Southeast Alaska, United States of America, North America

A lone photographer stands perched on a rock silhouetted against the dawn orange sky at Yaki Point, Grand Canyon National Park, UNESCO World Heritage Site, Arizona, United States of America, North America

Fault in the landscape caused by continental drift between North American and Eurasian tectonic plates at Thingvellir National Park near Reykjavik, Iceland, Polar Regions

Monument Valley Navajo Tribal Park, view from Artist Point, Merrick Butte (foreground), Utah, United States of America, North America

Monument Valley Navajo Tribal Park, view from John Ford's Point, Navajo Man on Horse, Utah, United States of America, North America

Monument Valley Navajo Tribal Park, view from John Ford's Point, Navajo Man on Horse, 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

Pallid bat (Antrozous pallidus) in captivity, Hidalgo County, New Mexico, United States of America, North America

Sandy Beach, Acadia National Park, Mount Desert Island, Maine, New England, United States of America, North America

Bass Harbor Head Lighthouse, Bass Harbor, Mount Desert Island, Acadia National Park, Maine, New England, United States of America, North America

Cape Royal Viewpoint at sunset, North Rim, Grand Canyon National Park, UNESCO World Heritage Site, Arizona, United States of America, North America

Sandstone Rock formations, Lower Antelope Canyon, Page, Arizona, United States of America, North America

Lone horse rider at John Fords Point, Merrick Butte, Monument Valley Navajo Tribal Park, Arizona, United States of America, North America

West Mitten Butte, East Mitten Butte and Merrick Butte, The Mittens at sunset, Monument Valley Navajo Tribal Park, Arizona, United States of America, North America

Wotans Throne, Cape Royal Viewpoint at sunset, North Rim, Grand Canyon National Park, UNESCO World Heritage Site, Arizona, United States of America, North America