Mountaineers and climbers, Mont Blanc range, French Alps, France, Europe

A high altitude porter carries a heavy load using the traditional basket and tump (headband) used by the Nepali porters, under Mera Peak, 6420 metres, a popular trekking peak in the Khumbu region, near Mount Everest, Himalayas, Nepal, Asia

A climber walks towards advanced base camp at 5800 metres on Mera Peak, 6420 metres, a popular trekking peak in the Khumbu region, with Mount Everest beyond, Nepal Himalaya, Nepal, Asia

A trekker heads up into the wilderness of the highest part of the Ecrins Massif in deep winter snow, above the village of Pelvoux, near Briancon, western Alps, Hautes Alpes, south west France, Europe

Natural history staff from the Lindblad Expedition ship National Geographic Endeavour doing various things in and around the Antarctic Peninsula

Natural history staff from the Lindblad Expedition ship National Geographic Endeavour doing various things in and around the Antarctic Peninsula

Distant hiker on stone staircase at sunset

Caucasian grandfather and granddaughter hiking on mountain

Rear view of woman hiking in woods

Smiling mixed race woman hiking with walking sticks

Portrait of smiling women hiking

Mixed race woman hiking with walking sticks

Smiling hiking women resting on a tree

Man climbing wall

Young couple soaks in the view of the fall colors and the Blue Ridge Parkway from Potato Knob while hiking the Mountains-to-Sea

Senior woman holding hiking poles, Utah, United States

Senior couple holding hiking poles, Utah, United States