Pico Cão Grande, São Tomé and Príncipe

Peak Lake, Somiedo Natural Park, Spain

Tidal Glacier - Kenai Fjords National Park, Alaska

InterContinental Resort Tahiti, French Polynesia

Boulder, CO after light snow dusting

Moeraki Boulders, NZ

Zion National Park, Angels Landing trail

At Hoover Dam, Nevada/Arizona

Erosion on the slopes of a volcano near Ankisabe, Madagascar

Fort Bourtange fort in, Bourtange, Groningen, Netherlands

Pathway to heaven Mt Cook, New Zealand

Erta Ale Range, Ethiopia

Blue Ice Cave, Antarctica, December 2011.