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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

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

Grand Canyon viewed from a cliff overlooking Papago Creek, with Papago Point just right of center, Grand Canyon National Park, UNESCO World Heritage Site, Arizona, United States of America, North America

Grand Canyon viewed before sunset, west of Papago Point, Grand Canyon National Park, UNESCO World Heritage Site, Arizona, United States of America, North America

A view of the upper Grand Canyon, Grand Canyon National Park, UNESCO World Heritage Site, Arizona, United States of America, North America

Whitmore Canyon from the helicopter, just before river mile 187, Grand Canyon National Park, Arizona, United States of America, North America

Night photography at South Canyon, just before river mile 32, Grand Canyon National Park, Arizona, United States of America, North America

An adult desert collared lizard (Crotaphytus bicinctores), basking in Grand Canyon National Park, 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

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

The colourful Grand Canyon of the Yellowstone, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, 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

Hoodoos, pine trees and snow lit by strong late afternoon sun in winter, near Sunrise Point, Bryce Canyon National Park, Utah, United States of America, North America

Rim cliffs and hoodoos lit by late afternoon sun in winter, Paria View, Bryce Canyon National Park, Utah, 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

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

Stone wall of the Window section, Arches National Park, Utah, United States of America, North America

The colourful sandstone formations of the Bryce Canyon National Park in the late afternoon, Utah, United States of America, North America

View from Cape Royal, North Rim, Grand Canyon National Park, UNESCO World Heritage Site, Arizona, United States of America, North America

Grand Canyon viewed from the cliffs east of Moran Point, Grand Canyon National Park, UNESCO World Heritage Site, Arizona, United States of America, North America

An adult desert collared lizard (Crotaphytus bicinctores), basking in Grand Canyon National Park, 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

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

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

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

The colourful Grand Canyon of the Yellowstone, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, 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

Sunset in the winter with snow from Sunset Point, Bryce Canyon National Park, Utah, United States of America, North America

A view of Natural Bridge Canyon in Death Valley National Park, California, 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 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

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

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

Arid landscape with dead tree in Kings Canyon, Watarrka National Park, Northern Territory, Australia, Pacific

Pinnacles and rock formations known as The Silent City, seen from Inspiration Point, with snow on the ground, in the Bryce Canyon National Park, Utah, United States of America, North America

Pinnacles and rock formations caused by erosion and known as The Silent City, seen from Inspiration Point, in the Bryce Canyon National Park, Utah, United States of America, North America

Rock formations caused by erosion, and a solitary pine tree above the Queens Garden, in the Bryce Canyon National Park, in Utah, United States of America, North America

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

Loch Ard Gorge on the rapidly eroding coatline of Port Campbell National Park on the Great Ocean Road, site of the famous Loch Ard wreck of 1878, Victoria, Australia

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

Grand Canyon, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, 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

Hikers on arch rock formation in Bryce Canyon Amphitheater, Bryce Canyon National Park, Utah, United States of America, North America

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

Snow on pinnacles and rock formations in the Bryce Canyon National Park in Utah, 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

Woman taking photos, Grand Canyon National Park, UNESCO World Heritage Site, Arizona, United States of America, North America

Rocks in the South Fork of the Kings River, with trees and crags in the background, in Cedar Gorge, Kings Canyon National Park, California, United States of America, North America

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

Woman looking over Grand Canyon, Grand Canyon National Park, UNESCO World Heritage Site, Arizona, United States of America, North America

Woman looking over Grand Canyon, Grand Canyon National Park, UNESCO World Heritage Site, Arizona, United States of America, North America

Anisclo Canyon and eroded karst limestone Mondoto peak, Ordesa and Monte Perdido National Park, Huesca, Aragon, Spain, Europe

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

Thor's Hammer near Sunset Point, Bryce Canyon National Park, Utah, United States of America, North America

Wooden seat on the rim of the Amphitheatre, in the Bryce Canyon National Park, Utah, United States of America, North America

Grand Canyon National Park, UNESCO World Heritage Site, Arizona, United States of America, 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

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

Pinnacles and rock formations caused by erosion, known as the Queens Garden, seen from Sunset Point, in the Bryce Canyon National Park, Utah, United States of America, North America