Oriol Alamany / Hiker walking the Calanche de Piana, Corse-du-Sud, Corsica Island, France, Model released.

Oriol Alamany / Hikers crossing scree along the 'Carros de foc' trail, Boi valley, Aiguestortes i Estany de Sant Maurici National Park, Pyrenees, Catalonia, Spain. No release available.

Bryan and Cherry Alexander / People walking down a snow slope to Windy Ridge, with altocumulus undulatus clouds above them. Patriot Hills. West Antarctica, January 2006.

Andrew Parkinson / Ptarmigan (Lagopus mutus) in white winter plumage framed by a walker passing by during a blizzard. Cairngorm Mountains, Scotland, UK. February (non-ex)

Floris van Breugel / Twilight descends on photographer's mountain camp with light inside tent, in Oregons highest mountain forest on Drake Peak at 8,500 feet. Oregon, USA, January 2010.

Laurent Geslin / Landscape of mountains in winter, with walkers crossing peaks, in the Jura region, Switzerland. January 2009

Colin Monteath / Baruntse, 7220 meters elevation, and mountaineering camp reflected in alpine lake, Makalu-Barun National Park, Nepal

Colin Monteath / Climber hauls load above 4,200 meter camp on the west buttress route of Mt Denali or Mt McKinley which reaches 6,194 meters elevation, Denali National Park and Preserve, Alaska

Colin Monteath / Climber on the summit of Pik Kommunizma at 7,500 meters elevation, highest mountain in the Pamirs, a mountain range in Tajikistan, central Asia

Leo & Mandy Dickinson / Climbers nearing summit, Great Trango, Pakistan

Doug Allan / Crossing a crevasse ladder in the Khumbu Icefall on Mount Everest Nepal. Model released. Freeze Frame book plate page 143.

Oriol Alamany / Hikers at Circ de Colomers, trekking the 'Carros de Foc' and GR11 routes, Aiguestortes i Estany de Sant Maurici National Park, Vall d'Aran, Pyrenees, Catalonia, Spain

Oriol Alamany / Hikers crossing a scree field in the Collada de Saburo Pass along the 'Carros de Foc' route, Aiguestortes i Estany de Sant Maurici National Park, Pyrenees, Catalonia, Spain. Model released

Oriol Alamany / Hiker crossing a scree field in the Collada de Saburo Pass along the 'Carros de Foc' route, Aiguestortes i Estany de Sant Maurici National Park, Pyrenees, Catalonia, Spain. Model released

Oriol Alamany / Hikers on Toll del Mas waterfall, Aiguestortes i estany de Sant Maurici National Park, Pyrenees, Alta Ribagorza, Catalonia, Spain

Oriol Alamany / Colomina mountain hut, with man playing the accordian, Aiguestortes i Estany de Sant Maurici National Park, Vall Fosca, Pyrenees Pallars Jussa , Catalonia, Spain

Oriol Alamany / Hiker with dog on the shores of Estany de Filia  alpine lake in Vall Fosca, Pyrenees, Pallars Jussa, Catalonia, Spain. Model released

Oriol Alamany / Hiker orienting a map with a compass in Estanys de Les Bouillouses, Pyrenees Catalanes Natural Park, Languedoc-Roussillon, France

Oriol Alamany / Woman hiker silhouetted at sunrise in Conangles valley, Aran Valley, Pyrenees, Catalonia, Spain. Model released

Oriol Alamany / Woman hiker walking the 'Carros de Foc' trail at Cirque de Travessani with Punta Alta peak (3013 m), Boi valley, Aiguestortes i Estany de Sant Maurici National Park, Pyrenees, Catalonia, Spain. Model...

Oriol Alamany / Hikers with tents at dawn in the valley of Remuae, Posets-Maladeta Natural Park, Ribagorza, Pyrenees, Huesca, Aragon, Spain. Model released.

Oriol Alamany / Two women hikers sitting with a Montana de los Pirineos domestic dog at sunset watching the Remuae Valley, Parque Natural Posets-Maladeta Ribagorza, Pyrenees Huesca, Aragon, Spain. Model released.

Oriol Alamany / Two women hiking in Remune valley, Posets-Maladeta Natural Park, Pyrenees, Huesca, Aragon, Spain. Model released.

Oriol Alamany / Women hiking, crossing a stream in Remuae valley, Posets-Maladeta Natural Park, Pyrenees, Huesca, Aragon, Spain. Model released.

Oriol Alamany / Woman hiking on a rainy day in the Aguas Tuertas in Hecho valley, Los Valles Occidentales Natural Park, Pyrenees, Aragon, Spain. Model released.

Oriol Alamany / Mountaineers camping in Aguas Tuertas with mist in Hecho valley, Los Valles Occidentales Natural Park, Pyrenees, Aragon, Spain

Oriol Alamany / People Hiking at sunrise on the trail to Anie peak (2507 m) in Belagua valley, Pyrenees, Navarra, Spain

Oriol Alamany / Hiking boots and backpacks at the entrance of Grey mountain hut, trekking in National Park Torres del Paine, Patagonia, Chile

Bryan and Cherry Alexander / Mountain tents and the Chilean Flag blowing in the wind. Patriot Hills, Antarctica, January 2006.

Bryan and Cherry Alexander / Pyramid tent and equipment of the Numis Polar Challenge team who retraced Scott's route using similar equipment. Patriot Hills. Antarctica, January 2006.

Bryan and Cherry Alexander / Mountain guide demonstrates clothing layers (underwear, midlayers and outer layers) at Mount Vinson Base Camp. Vinson Massif, Antarctica, January 2006. Digital composite.

Bryan and Cherry Alexander / Empty pulk with harness and ski poles at the Patriot Hills Camp. West Antarctica, January 2006.

Bryan and Cherry Alexander / Man demonstrating the layers he wears to keep warm (underwear, mid layers, outer layer, jacket & mittens) Antarctica, January 2006. Digital composite.

Bryan and Cherry Alexander / People putting up a mountain tent in a high wind. Patriot Hills, Antarctica, January 2006.

Bryan and Cherry Alexander / Two groups of climbers making their way from High Camp towards the Summit of Mount Vinson. Antarctica, January 2006.

Bryan and Cherry Alexander / Aerial view of Vinson Base Camp, Mount Vinson, Vinson Massif, Antarctica, January 2006.

Bryan and Cherry Alexander / Icefall behind Vinson Base Camp, with tents in foreground. Vinson Massif, Ellsworth Mountains, Antarctica, January 2006.

Bryan and Cherry Alexander / Norwegian mountaineers and their tents at Mount Vinson Base Camp. Vinson Massif, Antarctica, January 2006.

Bryan and Cherry Alexander / Norwegian mountaineer preparing the ropes for his climb at Mount Vinson Base Camp. Vinson Massif, Antarctica, January 2006.

Bryan and Cherry Alexander / Norwegian mountaineer preparing the ropes for his climb at Mount Vinson Base Camp. Vinson Massif, Antarctica, January 2006.

Bryan and Cherry Alexander / Norwegian mountaineers preparing for their climb at Mount Vinson Base Camp. Vinson Massif, Antarctica, January 2006.

Bryan and Cherry Alexander / Norwegian mountaineers preparing for their climb at Mount Vinson Base Camp. Vinson Massif, Antarctica, January 2006.

Bryan and Cherry Alexander / Norwegian mountaineers at Mount Vinson Base Camp. Vinson Massif, Antarctica, January 2006.

Oriol Alamany / Hiker studies map on signpost at the beginning of the Laguna Tower trail, El Chalten, Los Glaciares National Park, Patagonia, Argentina, January 2006

Oriol Alamany / Mountaineers below Cerro Torre (3102 m) and Glaciar Grande at sunrise, Los Glaciares National Park, Andes, Patagonia, Argentina, January 2006

Oriol Alamany / Mountaineers watching the sunrise over Cerro Torre (3102 m), Los Glaciares National Park, Andes, Patagonia, Argentina, January 2006

Oriol Alamany / Alpinist mountaineer crossing the Fitz Roy river with a tyrolean crossing (also called zip-line, flying fox, zip wire, aerial runway, death slide), Los Glaciares National Park, Patagonia, Argentina, J...

Andrew Parkinson / Ptarmigan (Lagopus mutus) in white winter plumage on exposed ridge as a climber walks past during a blizzard. Cairngorm Mountains, Scotland, UK. February (non-ex)

Floris van Breugel / Minaret Range in the Sierras from the top of the Volcanic Ridge, with photographer Floris van Breugel taking in the view. California, USA. July 2007.

Oriol Alamany / Mountain rescue dog (Canis familiaris) female carrying a backpack, near Nuria in Ribes valley, Pyrenees mountains, Catalonia, Spain

Oriol Alamany / Mountain rescue dog (Canis familiaris) female carrying a backpack, near Nuria in Ribes valley, Pyrenees mountains, Catalonia, Spain

Oriol Alamany / Mountaineers in tent at dusk, Anayet alpine lake shore with Midi d'Ossau peak in the background, Pyrenees mountains, Huesca, Aragon, Spain

Jerry Monkman / Ice climbing on the Root Glacier, Wrangell - St Elias NP, Kennecott, Alaska, USA. Learning ice climbing on the Root Glacier in Wrangell-St. Elias N.P.

Tim Laman / Skier Phil Atkinson unloads mountaineering gear from a ski plane on the Ruth Glacier, Denali National Park, Alaska, USA

Nick Turner / Gorge-walkers at Craig Y Ddinas waterfalls, Brecon Beacons National Park, Powys, Wales

Nick Groves / Climber soloing the summit of Mount Cook, Grand Traverse, Mount Cook National Park, New Zealand

Nick Groves / Climber soloing the summit of Mount Cook, Grand Traverse, Mount Cook National Park, New Zealand

Nick Groves / Mountaineer soloing the summit of Mount Cook, New Zealand

Philippe Clement / Rock climber climbing a hard route on a sandstone rock face, Luxemburg

Leo & Mandy Dickinson / Eric Jones and Rick Sylvester in an ice cave, Patagonia, Argentina, 1972

Leo & Mandy Dickinson / Doug Scott, British mountaineer 1993

Leo & Mandy Dickinson / Cliff Philipps climbing on the Brouillard 1970

Leo & Mandy Dickinson / Leo Dickinson cooking on the Patagonia Ice Cap

Leo & Mandy Dickinson / Sir Chris Bonnington, British mountaineer 1993

Leo & Mandy Dickinson / Ron Fawcett ice climbing 1983

Leo & Mandy Dickinson / Brian Mollineaux , Eric Jones & Eddie Birch bivouac Matterhorn, Winter 1976

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.

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

Leo & Mandy Dickinson / Climber Eric Jones on top of the Eiger, European Alps, Switzerland 1982

Leo & Mandy Dickinson / Eric Jones on Matterhorn summit, European Alps, Switzerland, 1976

Leo & Mandy Dickinson / Mandy Dickinson with porters climbing in Karakoram Himalayas range, Pakistan, 1994

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 / Ski mountaineer near summit with Mt Tasman behind, Westland National Park, New Zealand

Colin Monteath / Ski mountaineer on the Franz Josef Glacier near Drummond Peak, watching the sunset over the Tasman Sea, Westland National Park, New Zealand

Colin Monteath / Ski mountaineer near summit with Mt Tasman behind, Westland National Park, New Zealand

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

Colin Monteath / Climbers Mortimer and Trihey on the west ridge of Chongtar, 7300 meters, with Mustagh Tower behind, Karakoram, China

Norbert Wu / Mountaineer at entrance to the Imax Crevasse, large dangerous crevasse requires ropes and guides, Antarctica

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 / Climbers about to attempt the Ogre in the Karakorum, Himalayas, Pakistan

Leo & Mandy Dickinson / Trango Tower, Karakorum, Pakistan

Leo & Mandy Dickinson / Base jumpers on Great Trango, Pakistan

Leo & Mandy Dickinson / Climber nearing summit of Great Trango, Pakistan

Leo & Mandy Dickinson / Climbers on the Bonatti pillar on Dru Mountain, French Alps, Europe

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

Bryan and Cherry Alexander / Mountain guide demonstrates clothing layers (outer layer) at Mount Vinson Base Camp. Vinson Massif, Antarctica, January 2006.

Bryan and Cherry Alexander / Mountain guide demonstrates clothing layers (outer mid layer) at Mount Vinson Base Camp. Vinson Massif, Antarctica, January 2006.