Luke Spencer paddles off Outlet Falls in Washington State.

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Following the guideline her life depends on, a diver threads the needle through a stalagmite forest in Dan’s Cave on Abaco Island. A single, misplaced fin kick can shatter mineral formations tens of thousands of years old.

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A cooking tent belonging to expedition scientists glows in the twilight on the rim of the Nyiragongo volcano—one of the most active in the world—in the Democratic Republic of the Congo.

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Climber John “Razor Sharp” Benson weaves through skin-ripping pinnacles. In Malagasy, the formations are called tsingy, meaning “where one cannot walk barefoot.” The terrain resists intrusions from hunters, hungry cattle, and wildfires.

See more pictures from the November 2009 feature story “Living on a Razor’s Edge.”

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At dawn, a sliver of moon shines above the Western Cwm.

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A skier in Whistler, Canada, jumps through a ring of fire.

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Kayaking in Torssukatak fjord, near Kummiut, east Greenland

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Arrigetch Peaks, August 23, 2010
“These teeter-tottering granite boulders all wanted to slide,” Andrew Skurka says of a talus-covered pass in the central Brooks Range, where his friend Roman Dial joined him.

See more pictures from the March 2011 feature story “Circling Alaska in 176 Days.”

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