Enrique Lopez-Tapia / Thamserku Peak (6608m) surrounded by cloud with trees silhouetted below, Sagarmatha National Park (World Heritage UNESCO). Khumbu / Everest Region, Nepal, Himalaya, October 2011.

Enrique Lopez-Tapia / Thamserku Peak (6608m) surrounded by cloud with trees silhouetted below, Sagarmatha National Park (World Heritage UNESCO). Khumbu / Everest Region, Nepal, Himalaya, October 2011.

Enrique Lopez-Tapia / Prayer flags across Changri Shar Glacier from Kala Pattar (5545m), Sagarmatha National Park (World Heritage UNESCO). Khumbu / Everest Region, Nepal, Himalaya, October 2011.

Enrique Lopez-Tapia / Lichens at high altitude, Dudh Kosi Valley (4.600 m), Sagarmatha National Park (World Heritage UNESCO). Khumbu / Everest Region, Nepal, Himalaya

Enrique Lopez-Tapia / Buddhist prayer wheels spinning at Kunde (3.900m) Sagarmatha National Park (World Heritage UNESCO). Khumbu / Everest Region, Nepal, Himalaya, October 2011.

Enrique Lopez-Tapia / Ama Dablam (6.856 m) surrounded by clouds, Sagarmatha National Park (World Heritage UNESCO). Khumbu / Everest Region, Nepal, Himalaya, October 2011.

Enrique Lopez-Tapia / Ama Dablam (6.856 m) surrounded by clouds, Sagarmatha National Park (World Heritage UNESCO). Khumbu / Everest Region, Nepal, Himalaya, October 2011.

Enrique Lopez-Tapia / Ama Dablam (6856m) surrounded by clouds, Sagarmatha National Park (World Heritage UNESCO). Khumbu / Everest Region, Nepal, Himalaya, October 2011.

Enrique Lopez-Tapia / A domestic yak on a suspension bridge over the Dudh Kosi river, with prayer flags on either side, Sagarmatha National Park (World Heritage UNESCO). Khumbu / Everest Region, Nepal, Himalaya, October 20...

Enrique Lopez-Tapia / Cho Oyu with sunlight hitting the slopes, Sagarmatha National Park (World Heritage UNESCO). Khumbu / Everest Region, Nepal, Himalaya, October 2011.

Enrique Lopez-Tapia / People trekking on Cho La Pass (5.420m), Sagarmatha National Park (World Heritage UNESCO). Khumbu / Everest Region, Nepal, Himalaya, October 2011

Enrique Lopez-Tapia / Alpine / Yellow-billed chough (Pyrrhocorax graculus) flies over the turquoise waters of the sacred Dudh Pokhari Lake (4.800m), Gokyo, Sagarmatha National Park (World Heritage UNESCO), Khumbu / Everest...

Enrique Lopez-Tapia / Last evening light on the top of Everest (8848m) in Sagarmatha National Park, UNESCO World Heritage Site, Khumbu / Everest Region, Nepal, Himalaya, October 2011

Enrique Lopez-Tapia / Last light on the top of Everest (8848m), Sagarmatha National Park (World Heritage UNESCO). Khumbu / Everest Region, Nepal, Himalaya, October 2011.

Enrique Lopez-Tapia / Last light on the top of Everest (8848m), with Nuptse in shadow, Sagarmatha National Park (World Heritage UNESCO). Khumbu / Everest Region, Nepal, Himalaya, October 2011.

Enrique Lopez-Tapia / Sun on Mount Nuptse (7,860m) at sunset, Everest region, Sagarmatha NP, Khumbu, Himalayas, Nepal, October 2011

Patricio Robles Gil / Mount Everest (8,850m) at sunset, Sagarmatha National Park, Khumbu, Himalayas, Nepal, November 2007

Doug Allan / Abandonned drink can litter on the approach to Mount Everest Advanced Base camp (6,000m) Tibetan side of the mountain, April 2006

Doug Allan / Climbers trying out their oxygen equipment at Advanced Base Camp (6,400m) on Mount Everest, Tibet, May 2006

Doug Allan / Camerman Doug Allan filming on the Western Cwm of Mount Everest, Nepal, September 1992

Grant Dixon / Wind cloud over Mount Everest seen from Sagarmatha National Park, Nepal

Grant Dixon / Moon over summit of Mount Everest, Lhotse, and Nuptse as seen from Mount Pumori at sunset, Sagarmatha National Park, Nepal

Grant Dixon / Moon over summit of Mount Everest, Lhotse, and Nuptse as seen from Mount Pumori, Sagarmatha National Park, Nepal

Grant Dixon / Moon over summit of Mount Everest and Khumbu Glacier, Sagarmatha National Park, Nepal

Grant Dixon / Mount Everest, Lhotse, and Nuptse as seen from Mount Pumori, Sagarmatha National Park, Nepal

Gavin Maxwell / Mount Everest from Tibet, June 07, 'Wild China' series

Gavin Maxwell / Mount Everest viewed between prayer flags on Rongbuk monastery, Tibet, June 07, 'Wild China' series

Gavin Maxwell / Mount Everest, Base Camp with tents, Tibet, June 07. 'Wild China' series

Gavin Maxwell / Mount Everest and Rongbuk Glacier, Tibet, June 07, 'Wild China' series

Gavin Maxwell / Mount Everest and Rongbuk Glacier, Tibet, June 07, 'Wild China' series

Gavin Maxwell / Mount Everest from Tibet, June 07. 'Wild China' series

Gavin Maxwell / Mount Everest from Tibet, June 07, 'Wild China' series

Gavin Maxwell / Rongbuk monastery with Mount Everest in background, Tibet, June 07. 'Wild China' series

Gavin Maxwell / Rock pile and prayer flags with Mount Everest and Rongbuk Glacier, Tibet, June 07, 'Wild China' series

Gavin Maxwell / Jumping spider {Euophrys omnisupertes} world's highest dwelling creature and predator, Mount Everest, Tibet, June 07. 'Wild China' series

Gavin Maxwell / Jumping spider {Euophrys omnisuperstes} Mount Everest, world's highest dwelling resident and predator, Tibet, June 07. 'Wild China' series

Gavin Maxwell / Snow capped Mount Everest from Tibet, June 07. 'Wild China' series

Gavin Maxwell / Rongbuk Glacier with Mount Everest in background, June 2007, Tibet. 'Wild China' series

Colin Monteath / Mount Everest at dusk seed from Kala Pattar, Khumbu, Nepal

Colin Monteath / Mount Everest at dusk seed from Kala Pattar, Khumbu, Nepal

Colin Monteath / Skier descends Central Rongbuk Glacier with Mount Everest in the background, Tibet

Colin Monteath / Geof Bartram at 7000m, Changtse and North Col behind, Mount Everest, Tibet

Colin Monteath / Southwest face of Mount Everest, Nepal

Colin Monteath / Mount Everest, Lhotse and Makalu in the evening, seen from Gokyo Ri, Khumbu, Nepal

Colin Monteath / Southwest face of Mount Everest at sunset, Nepal

Colin Monteath / Mount Everest at dusk seed from Kala Pattar, Khumbu, Nepal

Colin Monteath / Morning mist clearing over Kangshung Face of Mount Everest after dawn, Tibet

Colin Monteath / North face of Mount Everest, Tibet

Colin Monteath / Skier on central Rongbuk Glacier, underneath the west ridge of Mount Everest during an ascent of the north face, Tibet

Colin Monteath / Panorama from Everest to Taweche with alpenglow, Khumbu, Nepal

Colin Monteath / Mount Everest and Nuptse at sunset from Kala Pattar, Khumbu, Nepal

Colin Monteath / Moon rising over west ridge of Mount Everest, from Kala Pattar, Khumbu, Nepal

Colin Monteath / Mount Everest west ridge, Tibet

Colin Monteath / Southwest face of Mount Everest at sunset, Nepal

Colin Monteath / Panorama from Everest to Taweche with alpenglow, Khumbu, Nepal

Leo & Mandy Dickinson / Reinhold Messner after Everest ascent without oxygen, 1978

Leo & Mandy Dickinson / Alison Hargreaves (1963 - 1995) on the North Col of Everest, 1995, the first woman to scale Mount Everest unassisted.

Leo & Mandy Dickinson / Reinhold Messner and Peter Habeler before Everest ascent without oxygen, the first people to do so, 1978.

Leo & Mandy Dickinson / Alison Hargreaves (1963 - 1995) climbing Mount Everest, 1995, the first woman to scale Mount Everest unassisted.

Leo & Mandy Dickinson / Sun setting over Pumori from North Col of Everest with clouds below, Himalayas, Nepal

Doug Allan / Climbers on the Khumbu icefall, Mount Everest, Himalayas, Nepal

Leo & Mandy Dickinson / Mount Everest, Himalayas, Nepal

Doug Allan / Looking up the Western CWM at 6200m on Mount Everest, Himalayas, Nepal

Leo & Mandy Dickinson / Aerial view of Mt Everest (from Nepalese side) with Lhotse ridge in fore ground, Himalayas, Nepal

Doug Allan / Lentincular banner clouds over summit of Mount Everest, Everest-Sagarmatha NP, Nepal

Michael Pitts / Tawache Peak, Mt Everest NP, Nepal

Leo & Mandy Dickinson / Himalayas with Mt Everest in background taken from Kala Patar, Nepal

Leo & Mandy Dickinson / North face of Everest with Rongbuk glacier in foreground, Tibet.

Leo & Mandy Dickinson / North east ridge of Mt Everest.

Doug Allan / Climber crossing a crevasse, Khumbu Ice Fall, Mt Everest, Nepal.

Colin Monteath / Dawn light on Mt Lhotse (Left) the South Col of Mt Everest (Center) and the Kangshung face of Mt Everest as seen from 6,200 meters elevation at Kharta Glacier, Tibet

Leo & Mandy Dickinson / Sherpa on ladder at Khumbu icefall. Mt. Everest, Himylayas, Nepal

Leo & Mandy Dickinson / Climbers Reinhold Messner and Peter Habeller dwarfed by Khumbu icefall block. Mt. Everest, Himylayas, Nepal

Doug Allan / Prayer flags at base camp, Mount Everest, Nepal

Doug Allan / Climbers in the Khumbu Icefall on Mount Everest, Nepal

Leo & Mandy Dickinson / Last tea house before Everest base camp, Gorak Shep glacier, Nepal

Colin Monteath / Mt Everest (8,850 meters) and Mt Nuptse (7,861 meters) seen from Kala Pattar, Khumbu, Himalaya, Nepal

Colin Monteath / Drogpa nomads herd Yaks above Kangshung Glacier, east of Mt Everest, Chomolonzo Peak is seen in the distance, Tibet

Colin Monteath / Mt Everest reflected in pond at 6,000 meters elevation, Kharta Glacier, Tibet

Colin Monteath / Mt Everest reflected in pond at 6,000 meters elevation, Kharta Glacier, Tibet

Colin Monteath / Dawn light on Lhotse, the south Col of Mt Everest, as seen from 6,200 meters elevation at Kharta Glacier, Tibet

Colin Monteath / Andy Henderson's hands with fingers amputated, one year after suffering frostbite on the North Face of Mt Everest, Tibet

Colin Monteath / Andy Henderson's frostbitten fingers, photographed in Lhasa, one week after descending the North Face of Mt Everest, Tibet

Colin Monteath / Mountaineer consulting Mt Everest map in camp at Pethang Ringmo under Mt Chomolonzo, Kangshung Glacier, Tibet

Colin Monteath / Mt Everest (8,850 meters) and Mt Nuptse (7,861 meters) seen from Kala Pattar, Khumbu, Himalaya, Nepal

Tui De Roy / Mt Everest showing the north face and Rongbuk Glacier from advance base camp, Rongbuk Valley, Tibet

Tui De Roy / Goat (Capra sp) herder with flock where grazing devastates high ridges near Lakpa La, high pass near base of Mt Everest, Tibet

Leo & Mandy Dickinson / Aerial view of Mount Everest, Nuptse ridge foreground right, Himalayas, Nepal

Doug Allan / Climber crossing crevasse using ladder. Khumbu Ice Fall Mount Everest, Nepal Himylayas. Freeze Frame book plate page 145.

Leo & Mandy Dickinson / Climbers Reinhold Messner and Peter Habeller negotiate icefall at 1200 metres. Mt. Everest, Himalayas, Nepal

Leo & Mandy Dickinson / Leo Dickinson crossing crevass, Everest 1978, Nepal

Leo & Mandy Dickinson / Distant view of Everest showing behind south face of Lhotse, Himalayas, Nepal

Leo & Mandy Dickinson / Base camp and yaks, Rongbuk Glacier, Mt Everest in distance, Tibet

Leo & Mandy Dickinson / North face of Everest, the Pinnacles and summit to right, Tibet

Leo & Mandy Dickinson / North face of Everest, Rongbuk glacier in foreground, Tibet

Michael Pitts / Lhotse ridge, Mt Everest NP, Himalayas, Nepal