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Red Wall Bridge crossing Roaring Springs Canyon on North Kaibab Trail, Grand Canyon North Rim, UNESCO, Arizona, United States of America

View of Roaring Springs Canyon along the North Kaibab Trail at Grand Canyon North Rim, UNESCO, Arizona, United States of America

View of the Roaring Springs Canyon cliffs from the Red Wall Bridge, Grand Canyon North Rim, UNESCO, Arizona, United States of America

Lonely Boulders and exposed rock in Pleasant Valley, Kaibab National Forest just north of Grand Canyon North Rim, Arizona, United States of America

The Coconino Overlook along the North Kaibab Trail at Grand Canyon North Rim, UNESCO, Arizona, United States of America

The 17th switchback along the North Kaibab Trail at Grand Canyon North Rim, UNESCO, Arizona, United States of America

The 18th switchback along the North Kaibab Trail at Grand Canyon North Rim, UNESCO, Arizona, United States of America

A curve in the North Kaibab Trail between Coconino Overlook and the Supai Tunnel Rest Area, Grand Canyon, Arizona, United States of America

The 20th switchback along the North Kaibab Trail at Grand Canyon North Rim, UNESCO, Arizona, United States of America

The interior of the Supai Tunnel along the North Kaibab Trail, Grand Canyon North Rim, UNESCO, Arizona, United States of America

The iron ore mine Cockerill d'Esch-sur-Alzette played a major role in economic boom from the 1870s to the 1990s, Luxembourg

An ephemeral pool of water in the granite riverbed of the Agua Fria River Canyon in the Agua Fria National Monument of Arizona.

An ephemeral pool of water in the granite riverbed of the Agua Fria River Canyon in the Agua Fria National Monument of Arizona.

Sign marking Badger Springs Road off of I-17 Arizona. This road leads to a hiking trail in the Agua Fria National Monument.

View of Black Canyon on the west side of the Agua Fria National Monument of Arizona with the Bradshaw Mountains in the distance.

View of Unfinished Obelisk in Aswan quarry on a sunny day, Aswan, Nubia, Egypt, North Africa, Africa

The cliffshide ruins of the engine house of Botallack tin mine, on the Atlantic coast near St Just, Cornwall, Great Britain.

Sandstone rock formation in the Dixie National Forest, Utah, USA. The National Forest was created in 1906.

Petrified Waterfall at dusk, elevated view, Hierve el Agua, San Lorenzo Albarradas, Oaxaca State, Mexico

Petrified Waterfall at dusk, elevated view, Hierve el Agua, San Lorenzo Albarradas, Oaxaca State, Mexico

A snow squall storm building up over Humphrey's Peak. Viewed from O'Leary Peak in the Coconino National Forest of Arizona. Adjacent to Sunset Crater National Monument.

Dead trees from a past forest fire on the slope of O'Leary Peak in northern Arizona. Sunset Crater Volcano is in the background.

Dakou Waterfall, Lushan (Mount Lu), Jiujiang City, Jiangxi, China. Lushan is a UNESCO World Heritage site, it is one of China's most famous mountains known for its natural beauty.

Dragon Head Cliff, Lushan (Mount Lu), Jiujiang City, Jiangxi, China. Lushan is a UNESCO World Heritage site, it is one of China's most famous mountains known for its natural beauty.

Three tiered waterfall (SanDieQuan) in Lushan (Mount Lu), Jiujiang City, Jiangxi, China. Lushan is a UNESCO World Heritage site, it is one of China's most famous mountains known for its natural beauty.

Teide volcano from La Ruleta viewpoint during sunset, Teide National Park, La Orotava, Santa Cruz de Tenerife, Tenerife, Canary Islands, Macaronesia, Spain, Western Europe

Two cars drive along the scenic road in Valley of Fire State Park on a sunny summer day, Nevada, United States of America

Warm light envelops majestic rock formation in Bryce Canyon National Park during a summer day, Utah, United States of America

Messner Mountain Museum (MMM), Kronplatz (Plan de Corones), Dolomites, near Brunico (Bruneck), South Tyrol (Alto Adige), Italy

Messner Mountain Museum (MMM), Kronplatz (Plan de Corones), Dolomites, near Brunico (Bruneck), South Tyrol (Alto Adige), Italy

Close to entrance to Jenny's Canyon, Snow Canyon State Park, near St. George, Utah, United States of America

Pieces of petrified wood on hills overlooking Dead Wash, Petrified Forest National Park, Arizona, United States of America

Red hills of bentonite clay overlooking Dead Wash in Petrified Forest National Park, Arizona, United States of America

Pieces of petrified wood on hills overlooking Dead Wash, Petrified Forest National Park, Arizona, United States of America

A canyon that drains into Dead Wash, Petrified Forest National Park, Arizona, United States of America

A canyon that drains into Dead Wash, Petrified Forest National Park, Arizona, United States of America

An unnamed canyon that leads into Dead Wash at Petrified Forest National Park, Arizona, United States of America

An island of rock in an unnamed canyon that leads to Dead Wash in Petrified Forest National Park, Arizona, United States of America

Patches of snow in the shade of a hill in Dead Wash at Petrified Forest National Park, Arizona, United States of America

Boulder pile in a valley leading to Dead Wash in Petrified Forest National Park, Arizona, United States of America