Colin Monteath / Mt Sefton, climber at dawn above Mueller hut and cloud-filled Mueller Glacier, Mt Cook National Park, New Zealand

Pete Oxford / Burchell's Zebra (Equus burchellii) herd drinking at waterhole, Africa

Flip Nicklin / Whale Shark (Rhincodon typus) surrounded by several scuba divers, threatened, Cocos Island, Costa Rica

Flip Nicklin / Two scuba divers swimming through sea cave with schooling Grunts, Cocos Island, Costa Rica

Colin Monteath / Hiker, Cerro Torre and Fitzroy reflected in small pond at dawn, Loma Plieque Tumbado, Los Glaciares National Park, Patagonia, Argentina

Colin Monteath / Mountaineer enjoying the view of Mt Everest and the Himalayan Mountains at sunset from Gokyo Ri, Khumbu, Nepal

Yva Momatiuk & John Eastcott / Lone hiker walking along the base of a sandstone butte strong pattern of wavy lines in petrified sand dunes are exposed by erosion, Vermilion Cliffs National Monument, Colorado Plateau, Utah

Yva Momatiuk & John Eastcott / Lone hiker walking along the base of a sandstone butte strong pattern of wavy lines in petrified sand dunes are exposed by erosion, Vermilion Cliffs National Monument, Colorado Plateau, Utah

Yva Momatiuk & John Eastcott / Lone hiker walking on colorful sandstone strong pattern of wavy lines in petrified sand dunes are exposed by erosion, Vermilion Cliffs National Monument, Colorado Plateau, Utah

Yva Momatiuk & John Eastcott / Alaska Range in spring snow, photographer resting in valley below mountains, Denali National Park and Preserve, Alaska

Colin Monteath / Climber enjoying view of Mt CookÆs Caroline Face from Ball Pass, Mt Cook National Park, New Zealand

Michael & Patricia Fogden / Brilliant trail with hiker, Monteverde Cloud Forest Reserve, Costa Rica