Mount Etna, Sicily, Italy, Europe

Mount Difficult Range in the north of the Grampians, the popular national park, Victoria, Australia

A climber tackles a difficult boulder problem on the glacial moraine at Tangnag, near Mera Peak and Mount Everest, Khumbu Region, Nepal, Himalayas, Asia

Nepali porter carries a heavy load using traditional wicker basket and tump headband in the lower Hingku Valley, close to Lukla and Mount Everest, Khumbu region, Himalayas, Nepal, Asia

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 porter crosses a river using a fallen log whilst carrying a heavy load up the Hingku Valley, near Lukla, south of Mount Everest, Nepal Himalaya, Nepal, Asia

Climber in shorts with trekking poles summits Mount Rainier, Washington.

Climber in shorts with trekking poles summits Mount Rainier, Washington.