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Pali sea cliffs on the Kalaulau trail, Napali Coast State Park, Kauai Island, Hawaii, United States of America, North America

View of Thor's Hammer from the Navajo Loop Trail in Bryce Canyon National Park, Utah, United States of America, North America

An adult California condor in flight on Angel's Landing Trail in Zion National Park, Utah, United States of America, North America

Fourth lake of valley of Five Lakes trail, Jasper National Park, UNESCO World Heritage Site, Canadian Rockies, Alberta, Canada, North America

View of Escalante Butte in the Grand Canyon from the Tanner Trail just before sundown, Grand Canyon National Park, UNESCO World Heritage Site, Arizona, United States of America, North America

Woman in Desert Loop Trail in Carlsbad Caverns National Park, New Mexico, United States of America, North America

A large petrified log along the Blue Mesa Trail in Petrified Forest National Park, Arizona, United States of America, North America

Giant redwoods on the Lady Bird Johnson Trail in Redwood National Park, UNESCO World Heritage Site, California, United States of America, North America

View along the Virgin River to Angels Landing from the Emerald Pools Trail, autumn, Zion National Park, Utah, United States of America, North America

Man enjoying the view along The Petrified Forest Loop Trail inside Theodore Roosevelt National Park, North Dakota, United States of America, North America

Man cross-country skiing, Puez Odle National Park, Dolomites, South Tirol, Trentino-Alto Adige, Italy, Europe

Pali sea cliffs on the Kalaulau trail, Napali Coast State Park, Kauai Island, Hawaii, United States of America, North America

Pali sea cliffs on the Kalaulau trail, Napali Coast State Park, Kauai Island, Hawaii, United States of America, North America

Provoking Lake at dawn on Highland Backpacking Trail, Algonquin Provincial Park, Ontario, Canada, North America

A large wall of fractured Granite along a trail in Constellation Park in Prescott called The Lost Wall, Arizona, United States of America, North America

Hills of Bentonite Clay called Teepees at the start of the Blue Forest Trail in Petrified Forest National Park, Arizona, 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

Dense ferns on the Marymere Falls Trail, Quinault Rain Forest, Olympic National Park, UNESCO World Heritage Site, Washington State, United States of America, North America

View along the Pa'rus Trail to Mount Spry and the East Temple, autumn, Zion National Park, Utah, United States of America, North America

The eastern edge of the Clam Bed Mesa along the Red Basin Trail in Petrified Forest National Park, Arizona, United States of America, North America

Cityscape from the High Line, a 2.33 km elevated linear park, greenway, and rail trail built on a former Central Railroad spur on the west side of Manhattan, New York City, United States of America, North America

A divide in the trail leading to the historic Agate House in Petrified Forest National Park, Arizona, United States of America, North America

A paved walkway leading to the entrance of the Long Logs Trail in Petrified Forest National Park, Arizona, United States of America, North America

View along the slope and hiking trail up towards the Red Crater Volcano, on Tongariro Alpine Crossing, Tongariro National Park, UNESCO World Heritage Site, North Island, New Zealand, Pacific

A dry waterfall on the west side of Hamilili Point, Hamilili being a Zuni word for petrified wood, next to a hoodoo on the south end of Petrified Forest National Park, Arizona, United States of America, North America

Hikers amongst hoodoo formations on the Sunrise Point Trail in Bryce Canyon National Park, Utah, United States of America, North America

Pali sea cliffs on the Kalaulau trail, Napali Coast State Park, Kauai Island, Hawaii, United States of America, North America

An island of rock just off the Billings Gap Trail at Petrified Forest National Park, Arizona, United States of America, North America

Aurora borealis (Northern Lights) on Kungsleden (Kings Trail), Abisko National Park, Lapland, Arctic Circle, Sweden, Scandinavia, Europe

Waterfall on the Marymere Falls Trail, Quinault Rain Forest, Olympic National Park, UNESCO World Heritage Site, Washington State, United States of America, North America

The eastern edge of the Clam Bed Mesa along the Red Basin Trail in Petrified Forest National Park, Arizona, United States of America, North America

A sheer cliff of rock jutting out from the Blue Mesa along the Billings Gap Trail in Petrified Forest National Park, Arizona, United States of America, North America

Woman hiking along The Petrified Forest Loop Trail inside Theodore Roosevelt National Park, North Dakota, United States of America, North America

View of Castleton village in the Hope Valley, Peak District National Park, Derbyshire, England, United Kingdom, Europe

A gnarled tree trunk among the colourful pinnacles and hoodoos on the Peekaboo Trail in Bryce Canyon National Park, Utah, United States of America, North America

View of the Petrified Forest National Park from the Long Logs Trail on the south end of the park, Arizona, United States of America, North America

The Giant Petrified Logs of Petrified Forest National Park, located along a trail behind the Rainbow Museum, Arizona, 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

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

Pali sea cliffs on the Kalaulau trail, Napali Coast State Park, Kauai Island, Hawaii, United States of America, North America

View over Bryce Amphitheatre from the Rim Trail at Bryce Point, Bryce Canyon National Park, Utah, United States of America, North America

A woman takes a break from hiking the trail in El Chalten National Park to take in the view, Lake Vied, Patagonia, Argentina, South America

Hiker on a mountain trail, Barre des Ecrins, Ecrins National Park, French Dauphine Alps, Haute Alpes, France, Europe

Coronada Butte viewed from the New Hance Trail on the south rim of the Grand Canyon, Grand Canyon National Park, UNESCO World Heritage Site, Arizona, United States of America, North America

Salt covered hills of Bentonite in the Petrified Forest National Park along the Blue Forest Trail, Arizona, United States of America, North America

Giant redwoods on the Lady Bird Johnson Trail in Redwood National Park, California, United States of America, North America

A very long fossilized tree along the Long Logs Trail at Petrified Forest National Park, Arizona, United States of America, North America

Linkmenas lake seen from the Ginuciai mound where the famous Linknenys castle stood during the 13th to 15th centuries, Ginuciai, Aukstaitija National Park, Lithuania,Europe

A mountain biker descends the trail from The Old Man of Coniston in the Lake District National Park, Cumbria, England, United Kingdom, Europe

Hikers amongst hoodoo formations on the Fairyland Trail in 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

View of Navajo sandstone formations from Angel's Landing Trail in Zion National Park, Utah, United States of America, North America

The Puez-Odle Nature Park, a very special place for nature lovers offering many hiking trails, peaks and flower fields, Funes, South Tyrol, Italy, Europe

View to Sinking Ship Mesa from the Rim Trail at Bryce Point, sunset, Bryce Canyon National Park, Utah, United States of America, North America

Great blue heron (Ardea herodias), standing alert beside trail in Shark Valley, Everglades National Park, Florida, United States of America, North America

75 Mile Creek from the Tanner Trail in the Grand Canyon, with Lipan Point on the upper left and Escalante Butte on the upper right, Grand Canyon National Park, UNESCO World Heritage Site, Arizona, 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

Fall color change amongst the trees and shrubs on the Rock Creek Trail in Denali National Park, Alaska, United States of America, North America

A canyon in Dead Horse Ranch State Park along the historic Lime Kiln Trail, Cottonwood, Arizona, United States of America, North America

A view from the Mossy Cave Trail of red rock and hoodoos, Bryce Canyon National Park, Utah, United States of America, North America

The paved path, that used to be an old road, leading to the Long Logs Trail and Agate House in Petrified Forest National Park, Arizona, United States of America, North America

View of trail lights on Ladybower Reservoir bridge at dusk, Peak District National Park, Derbyshire, England, United Kingdom, Europe

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

Mist rising on Bunnyrabbit Lake at dawn on La Cloche Silhouette Trail, Killarney Provincial Park, Ontario, Canada, North America

Pali sea cliffs on the Kalaulau trail, Napali Coast State Park, Kauai Island, Hawaii, United States of America, North America

Aurora borealis (Northern Lights) on Kungsleden (Kings Trail), Abisko National Park, Lapland, Arctic Circle, Sweden, Scandinavia, Europe

Hiker walking on the Alpine circuit trail, Lake O'Hara, Yoho National Park, UNESCO World Heritage Site, Canadian Rockies, Alberta, Canada, North America

Trail lights on Banff Avenue and St. Paul's Presbyterian Church, Snow Peak visible through clouds, Banff, Banff National Park, Alberta, Canada, North America

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

A large petrified log along the Blue Mesa Trail in Petrified Forest National Park, Arizona, United States of America, North America

Salt covered hills of Bentonite in the Petrified Forest National Park along the Blue Forest Trail, Arizona, United States of America, North America

View from the Pa'rus Trail across the Virgin River to the Watchman at sunset, autumn, Zion National Park, Utah, United States of America, North America

Dry stone wall and gate on a trail that follows the southern shore of Ullswater, Lake District National Park, UNESCO Worl Heritage Site, Cumbria, England, United Kingdom, Europe

View of O'Neill Butte on the left and Grand Canyon on the right from the edge of Cedar Ridge along the South Kaibab Trail, Grand Canyon National Park, UNESCO World Heritage Site, Arizona, United States of America, North America

Path among California redwoods, Armstrong Woods State Park, near Guerneville, California, United States of America, North America

An overlook along the Transept Trail with Oza Butte just right of center at Grand Canyon North Rim, Grand Canyon National Park, UNESCO World Heritage Site, Arizona, United States of America, North America

American alligator (Alligator mississippiensis), swimming beside trail in Shark Valley, Everglades National Park, Florida, United States of America, North America

Panoramic view over the Silent City from the Rim Trail at Inspiration Point, dawn, Bryce Canyon National Park, Utah, United States of America, North America

Barranco La Goleta, gorge, trail from Cruz del Carmen to Bajamar, Anaga Rural Park, Tenerife Island, Canary Islands, Spain, Atlantic, Europe

Waterfall, lake and blue sky, Petrohue Los Enamorados Trail, Vicente Perez Rosales National Park, Spring, Lakes District, Chile, South America

Among giant redwoods on the Boy Scout Tree Trail in Jedediah Smith Redwoods State Park, UNESCO World Heritage Site, California, 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

Woman looking out on Kew Mae Pan Nature Trail at Doi Inthanon National Park, Chiang Mai, Thailand, Southeast Asia, Asia

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