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January 24, 2012 - Yellow sulphurous deposits resulting from degassing coating scoria cone formed during eruption on Nyamuragira Volcano, Democratic Republic of Congo.

Hikers on a path along levada (aqueduct) of Green Cauldron (Caldeirao Verde), Madeira island, Atlantic Ocean, Portugal

Aspen trees in autumn colors east of Greenland Lake, Grand Canyon North Rim, Arizona, United States of America

The upper leg of the North Kaibab Trail at Grand Canyon North Rim, UNESCO, Arizona, United States of America

The 12th switchback along the North Kaibab Trail at Grand Canyon North Rim, UNESCO, Arizona, United States of America

Ardvreck Castle and Stac Pollaidh, Loch Assynt, Ross and Cromarty, Highlands, Scotland, United Kingdom

An old gate to the sinkhole called the Keyhole Sink in Williams Arizona within the Kaibab National Forest.

The fire watchtower on the summit of O'Leary Peak in the Coconino National Forest of Arizona. Adjacent to the Sunset Crater National Monument.

Forest Service Road that leads to the O'Leary Peak Watchtower and Overlook. Adjacent to Sunset Crater National Monument Arizona in the Coconino National Forest.

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.

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.

The Forest Service Road that leads to the summit of O'Leary Peak in the Coconino National Forest of Arizona.

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

The eastern summit of O'Leary Peak in the Coconino National Forest of Arizona. Adjacent to the Sunset Crater National Monument.

View of mist covered landscape from Wulao Feng (Five-Old-Man Peak) at Lushan (Mount Lu), UNESCO, Jiujiang City, Jiangxi, China

Valle Rojo (Red Valley) at sunrise, near Rainbow Mountain, Pitumarca District, Cusco (Cuzco) Region, Peru, South America

Tre Cime di Lavaredo (Three Peaks of Lavaredo), Three Peaks Nature Park, Dolomites, UNESCO, South Tyrol (Alto Adige), Italy

Alpine poppies above the Lago dei Piani inferiore, Three Peaks Nature Park, Dolomites, South Tyrol (Alto Adige), Italy

North face of Tre Cime di Lavaredo (Three Peaks of Lavaredo), Three Peaks Nature Park, Dolomites, UNESCO, South Tyrol (Alto Adige), Italy

Mountain Hut A.Locatelli-S.Innerkofler, Three Peaks Nature Park, Dolomites, South Tyrol (Alto Adige), Italy

Hiker on path between Locatelli and Pian di Cengia refuges with Punta dei Tre Scarperi behind, Three Peaks Nature Park, Dolomites, South Tyrol, Italy

Cliff view of Dead Wash Valley in Petrified Forest National Park, at sundown, Arizona, United States of America

Al Hajir seen from track (Al Barida Road) on western slope of Djebel Ahkdar below Sharaf al Alamayn Pass, 2036m, Oman, Arabian Peninsula

Wakan village in the Western Hajar Mountains, border South Batinah and Al Dakhiliyah Governorates, Sultanate of Oman, Arabian Peninsula

Wakan village, Western Hajar Mountains, border South Batinah Governorate and Al Dakhiliyah Governorates, Sultanate of Oman, Arabian Peninsula

Tent Set Up Beside Mountain Lake with Rugged Peaks Reflected in Still Water, Nelson Lakes, New Zealand

Distant view of layered mountain ranges of Sierra Nevda and Sierras de Tejeda, Almijara y Alhama align, with a prominent peak, Andalusia, Spain

Rocky mountain trail, with a lone windswept tree and panoramic views of the surrounding landscape, Sierra Nevada, Andalusia, Spain

Acrocorinth historic castle on top of the mountain with Euphorbia characias (Mediterranean spurge) yellow flowers, Greece

Drone aerial view of Meteora and ancient holy Monastery of Varlaam and Great Meteoron, UNESCO, Kalabaka, Greece

Monemvasia, historic city on an island with a mountain in turquoise sea, Monemvasia, Laconia, Greece

Mountain landscape on Kilimanjaro, 5895 metres, UNESCO, highest mountain in Africa and one of the Seven Summits, Tanzania

Mountain landscape on Kilimanjaro, 5895 metres, UNESCO, highest mountain in Africa and one of the Seven Summits, Tanzania

Mountain landscape on Kilimanjaro, 5895 metres, UNESCO, highest mountain in Africa and one of the Seven Summits, Tanzania

Rock climber in action on the world-famous granite boulders of the Buttermilks, Bishop, Sierra Nevada, California, United States of America

Mountain landscape on Kilimanjaro, 5895 metres, UNESCO, highest mountain in Africa and one of the Seven Summits, Tanzania

The south entrance of the historic Johnson Canyon Railroad Tunnel, Kaibab National Forest of Arizona, USA

Truck on the road along the Indus River, Leh district, Ladakh region, state of Jammu and Kashmir, India, Asia

Trekker on the way down from Stokla pass (4900) to the village of Stok, Hemis National Park, Ladakh region, state of Jammu and Kashmir, India, Asia

Arrangement of shale stones in a circle, on the way down from Stokla pass (4900) to the village of Stok, Hemis National Park, Ladakh region, state of Jammu and Kashmir, India, Asia

Trekker on the way down from Stokla pass (4900) to the village of Stok, Hemis National Park, Ladakh region, state of Jammu and Kashmir, India, Asia

Ice flower sculpted by wind at Stokla pass (4900m), Hemis National Park, Ladakh region, state of Jammu and Kashmir, India, Asia