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Red Rock State Park viewed from the Eagle Nest Trail Overlook, Sedona, Arizona, 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

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

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

Views from the Skyline Trail of 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

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

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

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

Meltwater river on Mount Rainier from the Burroughs Mountain Trail, 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

Alaska Range seen from K'esugi Ridge Trail, Denali State Park, Matanuska-Susitna Borough, Southcentral Alaska, Alaska, 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

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

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

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

Walkway through cold lava in the Craters of the Moon National Park, Idaho, 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

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

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

Hoodoos lit by early morning sun in winter, Peekaboo Loop Trail, Bryce Canyon National Park, Utah, United States of America, North America

Rock forms above Echo Canyon, morning on the trail to Observation Point, October, Zion Canyon, Zion National Park, Utah, United States of America, North America

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

The cliffs of Bright Angel Canyon at Grand Canyon viewed from the start of Garden Creek Canyon along Bright Angel Trail, Grand Canyon National Park, UNESCO World Heritage Site, Arizona, United States of America, North America

Kanarra Creek hiking trail through slot canyon, Kolob Canyons section of Zion National Park, Utah, Western United States, USA

A giant petrified log balanced on a sandstone pedestal in Petrified Forest National Park Arizona along the Red Basin Trail.

The shallow pond at Petrified Forest National Park Arizona called Dry Creek Tank along the Red Basin Trail.

Family enjoying walking in a frozen snowy forest on a winter trail, Riisitunturi National Park, Posio, Lapland, Finland

The first tunnel along Bright Angel Trail in winter under Moonlight on the South Rim of Grand Canyon, Grand Canyon National Park, UNESCO World Heritage Site, Arizona, United States of America, North America

Rocks and hoodoos 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

Large hoodoos strongly lit by early morning sun in winter, Queen's Garden Trail, Bryce Canyon National Park, Utah, United States of America, North America

Walkway through cold lava in the Craters of the Moon National Park, Idaho, United States of America, North America

View of trail lights, sand dunes and mountains at dusk, Corralejo Natural Park, Fuerteventura, Canary Islands, Spain, Atlantic, Europe

Forest trail, Sleeping Bear Dunes National Park, Glen Arbor, Michigan, United States of America, North America

Hoodoos and cloudy sky in winter, Rim Trail near Sunrise Point, Bryce Canyon National Park, Utah, United States of America, North America

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

Walkway through cold lava in the Craters of the Moon National Park, Idaho, United States of America, North America

Walkway through cold lava in the Craters of the Moon National Park, Idaho, United States of America, North America

A wild burro near the Mosaic Canyon Trail in Death Valley National Park, California, United States of America, North America

View of Hermit Canyon from Dripping Springs trail at Grand Canyon, Grand Canyon National Park, UNESCO World Heritage Site, Arizona, United States of America, North America

Scenic view of Grand Canyon from Ooh Aah Point on South Kaibab Trail, Grand Canyon National Park, Arizona, USA

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

View into Zion Canyon from trail to Observation Point, Zion Canyon, Zion National Park, Utah, United States of America, North America

View of Yuma Point from Hermit Trail in winter at Grand Canyon, Grand Canyon National Park, UNESCO World Heritage Site, Arizona, United States of America, North America

Slabs of stone along the Red Basin Trail called the Tabletops at Petrified Forest National Park Arizona.

Hikers on steel ladders, Horad River Gorge Hiking Trail, Slovensky Raj, Paradise National Park, Slovakia, Europe

Alligator, Anhinga Trail, Everglades National Park, Florida, United States of America, North America

Tourists on boardwalk trail through protected land of bogs and marshes, Kemeri National Park near Jurmala, Latvia, Baltic States, Europe

Goblin Forest, Kamahi Forest, Dawson Falls Track, Mount Egmont National Park, Taranaki, North Island, New Zealand, Pacific

Leafless Dhok trees, Anogeissus pendula, in deciduous forest at Ranthambhore National Park, Rajasthan, Northern India

Eco-tourists by Padam Lake and Jogi Mahal hunting lodge in Ranthambhore National Park, Rajasthan, Northern India

Tourists hill climbing on nature trail in lakeland countryside at Easedale in the Lake District National Park, Cumbria, UK

Tour group of eco-tourists in Maruti Suzuki Gypsy King 4x4 vehicle in Ranthambhore National Park, Rajasthan, Northern India

Spotted deer, Axis axis, (Chital), by ruins of mosque in Ranthambhore National Park, Rajasthan, India

Tour groups of eco-tourists in Maruti Suzuki Gypsy King 4x4 vehicle at waterhole in Ranthambhore National Park, Rajasthan, India

Spotted deer, Axis axis, (Chital), by ruins of mosque in Ranthambhore National Park, Rajasthan, India

Spotted deer, Axis axis, (Chital), by ruins of mosque in Ranthambhore National Park, Rajasthan, India

Tourist walking on nature trail in lakeland countryside at Easedale in the Lake District National Park, Cumbria, UK

Tourist on nature trail in lakeland countryside at Easedale Tarn lake in the Lake District National Park, Cumbria, UK

Young pilgrims with shell symbol reach end of pilgrim trail in Santiago de Compostela and stroll in Alameda Park, Santiago de Compostela, Galicia, Spain, Europe

Eco-tourists by Padam Lake and Jogi Mahal hunting lodge in Ranthambhore National Park, Rajasthan, Northern India

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

Foxglove, Digitalis purpurea, wildflower on nature trail in lakeland countryside by Easedale in Lake District National Park, Cumbria, UK

Hiking trail and hikers in the Canon de Anisclo (Anisclo Canyon), Ordesa y Monte Perdido National Park, Aragon, Spain, Europe

Bog Asphodel, Narthecium ossifragum, on nature trail in lakeland countryside by Easedale in Lake District National Park, Cumbria, UK

Hiking trail and rocky peaks on Cradle Mountain on the Overland Track, Cradle Mountain Lake St. Clair National Park, part of Tasmanian Wilderness, UNESCO World Heritage Site, Tasmania, Australia, Pacific

Woman walking on trail in Tsitsikamma National Park, Storms River, Eastern Cape, South Africa, Africa

Hiking trail and rocky peaks on Cradle Mountain on the Overland Track, Cradle Mountain Lake St. Clair National Park, part of Tasmanian Wilderness, UNESCO World Heritage Site, Tasmania, Australia, Pacific