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View over the cliffs of the Zion National Park and the Angel's Landing path, Zion National Park, Utah, United States of America, North America

Hiking the Queens Garden Trail, Bryce Canyon National Park, Utah, United States of America, North America

Alaska Range seen from K'esugi Ridge Trail, Denali State Park, Matanuska-Susitna Borough, Southcentral Alaska, Alaska, United States of America, North America

A winter dawn view of Grand Canyon from Bright Angel Trail on the South Rim, Grand Canyon National Park, UNESCO World Heritage Site, Arizona, United States of America, North America

Adult hoary marmot (Marmota caligata), on the Skyline Trail, Mount Rainier National Park, Washington State, United States of America, North America

Early light on Mount Rainier from the Burroughs Mountain Trail, Mount Rainier National Park, Washington State, United States of America, North America

Looking toward Mount Bell from the Arnica Lake Trail, Banff National Park, UNESCO World Heritage Site, Alberta, Canadian Rockies, Canada, North America

Mount Ngauruhoe, Tongariro Alpine Crossing, Tongariro National Park, UNESCO World Heritage Site, North Island, New Zealand, Pacific

A view from the upper trail, Iguazu Falls National Park, UNESCO World Heritage Site, Misiones, Argentina, South America

Hoodoo rock formations from the Fairyland Trail, Bryce Canyon National Park, Utah, United States of America, North America

Green heron (Butorides virescens), perching over water beside the Anhinga Trail, Everglades National Park, Florida, United States of America, North America

View over the cliffs of the Zion National Park and the Angel's Landing trail, Zion National Park, Utah, United States of America, North America

Junction sign for the trails leading to Angels Window and Cape Royal at Grand Canyon North Rim, Grand Canyon National Park, UNESCO World Heritage Site, Arizona, United States of America, North America

Hiker photographing on the Queens Garden Trail, Bryce Canyon National Park, Utah, United States of America, North America

Winter landscape and trail lights on Snake Pass, Peak District National Park, Derbyshire, England, United Kingdom, Europe

Early light on Mount Rainier from the Burroughs Mountain Trail, Mount Rainier National Park, Washington State, United States of America, North America

Meltwater lake on Mount Rainier from the Burroughs Mountain Trail, Mount Rainier National Park, Washington State, United States of America, North America

A view from the upper trail, Iguazu Falls National Park, UNESCO World Heritage Site, Misiones, Argentina, South America

Midway Geyser Basin thermal activity from the Fairy Creek Trail, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Hiker on Navajo Loop Trail with hoodoos and pine trees lit by early morning sun in winter, Bryce Canyon National Park, Utah, United States of America, North America

Hoodoos and snow lit by strong dawn light in winter, Queen's Garden Trail at Sunrise Point, Bryce Canyon National Park, Utah, United States of America, North America

View of the valley floor from Angel's Landing Trail in Zion National Park, Utah, United States of America, North America

Thor's Hammer from the Navajo Loop Trail on a partially cloudy day, Bryce Canyon National Park, Utah, United States of America, North America

A winter sunrise view of Grand Canyon Arizona from Bright Angel Trail on the South Rim just past the second tunnel, Grand Canyon National Park, UNESCO World Heritage Site, Arizona, United States of America, North America

Views of the Nisqually Glacier retreat from the Skyline Trail, Mount Rainier National Park, Washington State, United States of America, North America

Meltwater lake on Mount Rainier from the Burroughs Mountain Trail, Mount Rainier National Park, Washington State, United States of America, North America

View of Canadian Rockies with autumn larch trees from Ptarmigan Cirque Trail near Peter Lougheed Provincial Park, Kananaskis, Alberta, Canada, North America

Midway Geyser Basin thermal activity from the Fairy Creek Trail, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Rock and pine trees lit by early morning sun in winter, Queen's Garden Connecting Trail, Bryce Canyon National Park, Utah, United States of America, North America

Hoodoos, rim and snow lit by dawn light in winter, Queen's Garden Trail at Sunrise Point, Bryce Canyon National Park, Utah, United States of America, North America

Hoodoos with snow lit by late afternoon sun, from Rim Trail near Sunset Point, Bryce Canyon National Park, Utah, United States of America, North America

Rim tree and hoodoos with a cloudy winter's sunrise, Rim Trail near Inspiration Point, Bryce Canyon National Park, Utah, United States of America, North America

View from the summit of Squared Off Butte along the Onyx Trail in Petrified Forest National Park, Arizona, United States of America, North America

Hiking trail, Sector Palmas de Ocoa, La Campana National Park, Cordillera De La Costa, Quillota Province, Valparaiso Region, Chile, South America

An overlook along the Transept Trail at Grand Canyon North Rim at twilight, Grand Canyon National Park, UNESCO World Heritage Site, Arizona, United States of America, North America

Hiking the Queens Garden Trail, Bryce Canyon National Park, Utah, United States of America, North America

Mountains reflected in a lake along Valley of Five Lakes trail, Jasper National Park, UNESCO World Heritage Site, Alberta, Canada, North America

Alaska Range seen from K'esugi Ridge Trail, Denali State Park, Matanuska-Susitna Borough, Southcentral Alaska, Alaska, United States of America, North America

Meltwater lake on Mount Rainier from the Burroughs Mountain Trail, Mount Rainier National Park, Washington State, United States of America, North America

Views of the Nisqually Glacier from the Skyline Trail, Mount Rainier National Park, Washington State, United States of America, North America

A view of the hoodoos from the Fairyland Trail in Bryce Canyon National Park, Utah, United States of America, North America

A view of the hoodoos from the Rim Trail in Bryce Canyon National Park, Utah, United States of America, North America

A view of the hoodoos from the Fairyland Trail in Bryce Canyon National Park, Utah, United States of America, North America

Popular rock formation (hoodoo) named Thor's Hammer taken from Navajo Loop Trail, Bryce Canyon National Park, Utah, USA

Canyon Pines, pine trees frame a view from the base of Bridge Mountain, Watchman Trail, Zion National Park, Utah, United States of America, North America

Rocks and lone pine tree lit by dawn light in winter, Queen's Garden Trail, Sunrise Point, Bryce Canyon National Park, Utah, United States of America, North America

Looking towards Styhead Tarn on the trail towards Great Gable and Scafell Pike in The Lake District National Park, Cumbria, England, United Kingdom, Europe

Hoodoo rock formations from the Fairyland Trail, Bryce Canyon National Park, Utah, United States of America, North America

View of hoodoo formations from the Fairyland Trail in Bryce Canyon National Park, Utah, United States of America, North America

Bright Angel Point trail sign pointing the way to the overlook on Grand Canyon North Rim, Grand Canyon National Park, UNESCO World Heritage Site, Arizona, United States of America, North America

Sign marking the Nankoweap Trail for the Saddle Mountain Wilderness that borders Grand Canyon National Park, Arizona, United States of America, North America

Aerial view of the Bungle Bungle, Purnululu National Park, UNESCO World Heritage Site, Kimberley, Western Australia, Australia, Pacific

View of the Deadhorse Creek Trail, Mount Rainier National Park, Washington State, United States of America, North America

Adult hoary marmot (Marmota caligata), on the Skyline Trail, Mount Rainier National Park, Washington State, United States of America, North America

Red Rock State Park viewed from the Eagle Nest Trail Overlook, Sedona, Arizona, United States of America, North America

A view of the hoodoos from the Fairyland Trail in Bryce Canyon National Park, Utah, United States of America, North America

Hoodoo rock formations from the Fairyland Trail, Bryce Canyon National Park, Utah, United States of America, North America

Buddhist stupa on trail with Ama Dablam behind, near Tengboche, Sagarmatha National Park, UNESCO World Heritage Site, Solukhumbu District, Nepal, Himalayas, Asia

View of The Amphitheater from the Navajo Loop Trail in Bryce Canyon National Park, Utah, United States of America, North America

Grand Canyon viewed from the Bright Angel Trail in winter just past the 1.5 Mile Rest House after sunrise, Grand Canyon National Park, UNESCO World Heritage Site, Arizona, United States of America, North America

View of the Deadhorse Creek Trail, Mount Rainier National Park, Washington State, United States of America, North America

Aerial view of woman snowshoeing on trail in the snowcapped forest at twilight, Oulanka National Park, Ruka Kuusamo, Lapland, Finland

A view of Mosaic Canyon Trail in Death Valley National Park, California, United States of America, North America

Desert collared lizard (Crotaphytus bicinctores), Mosaic Canyon Trail, Death Valley National Park, California, United States of America, North America

Desert collared lizard (Crotaphytus bicinctores), Mosaic Canyon Trail, Death Valley National Park, California, United States of America, North America

The trail to The Old Man of Coniston in the Lake District National Park, Cumbria, England, United Kingdom, Europe

A sedimentary Pipe, Angel's Palace trail, Kodachrome Basin State Park, Grand Staircase-Escalante National Monument, Kane County, Utah, United States of America, North America

View of Hermit Canyon and Hermit Basin from the Boucher Trail at Grand Canyon with Pima Point on the upper left, Grand Canyon National Park, UNESCO World Heritage Site, Arizona, United States of America, North America

View of trail lights through Mancha Blanca, Timanfaya National Park at dusk, Mancha Blanca, Lanzarote, Las Palmas, Canary Islands, Spain, Atlantic, Europe

The cliffs of Bright Angel Canyon along the Bright Angel Trail in winter at sunrise on the South Rim of Grand Canyon, Grand Canyon National Park, UNESCO World Heritage Site, Arizona, United States of America, North America

Views from the Skyline Trail of Mount Rainier National Park, Washington State, United States of America, North America

A mountain biker in Titus Canyon in Death Valley National Park, California, United States of America, North America

Hermit Canyon at Grand Canyon viewed from the east side of Yuma Point along the Boucher Trail with Pima Point on the upper right, Grand Canyon National Park, UNESCO World Heritage Site, Arizona, United States of America, North America

The cliffs of Bright Angel Canyon along the Bright Angel Trail in winter near midday on the South Rim of Grand Canyon, Grand Canyon National Park, UNESCO World Heritage Site, Arizona, United States of America, North America

Meltwater river on Mount Rainier from the Burroughs Mountain Trail, Mount Rainier National Park, Washington State, United States of America, North America

A field of hoodoos along the Red Basin Trail in Petrified Forest National Park Arizona called Pharaoh's Garden.

A view from the upper trail, Iguazu Falls National Park, UNESCO World Heritage Site, Misiones, Argentina, South America

A view from the upper trail, Iguazu Falls National Park, UNESCO World Heritage Site, Misiones, Argentina, South America

Ancient Indian petroglyphs along the Onyx Trail at Petrified Forest National Park, Arizona, United States of America, North America

A view from the lower trail, Iguazu Falls National Park, UNESCO World Heritage Site, Misiones, Argentina, South America

Hoodoos, rim and snow lit by dawn light in winter, Queen's Garden Trail at Sunrise Point, Bryce Canyon National Park, Utah, United States of America, North America

Snow-covered mountains in the spring from Trail Ridge Road, Rocky Mountain National Park, Colorado, United States of America, North America

View of Hermit Canyon from the east side of Yuma Point at Grand Canyon Arizona along the Boucher Trail with Pima Point on the upper right, Grand Canyon National Park, UNESCO World Heritage Site, Arizona, United States of America, North America

Alaska Range seen from K'esugi Ridge Trail, Denali State Park, Matanuska-Susitna Borough, Southcentral Alaska, Alaska, United States of America, North America

Small lake with Alaska Range in background, seen from K'esugi Ridge Trail, Denali State Park, Matanuska-Susitna Borough, Southcentral Alaska, Alaska, United States of America, North America

Mount Ngauruhoe, Tongariro Alpine Crossing, Tongariro National Park, UNESCO World Heritage Site, North Island, New Zealand, Pacific

A view from the upper trail, Iguazu Falls National Park, UNESCO World Heritage Site, Misiones, Argentina, South America

A view from the lower trail, Iguazu Falls National Park, UNESCO World Heritage Site, Misiones, Argentina, South America

Snowy cliffs from Peekaboo Loop Trail, Bryce Canyon National Park, Utah, United States of America, North America