As soon as Vincent Keipper turned his back on Kilimanjaro's Furtwängler Glacier earlier this year, he heard the ice begin to stir, then a loud crack. "We turned to see the ice mass collapse with a roar," the amateur adventurer says. But Furtwängler is not the only big block of ice feeling the heat in the new millennia. Read more about the condition of tropical glaciers in our online exclusive >>

Considered one of the most cataclysmic geological events in human history, Krakatoa's ferocious eruption of 1883 blew the mountain to bits. Today, the volcano's remnant islets are part of Indonesia's premier national park, Ujung Kulon. Join photographer Martin Westlake and writer Jamie James with outtakes from their pilgrimage to the Indonesian fire god. Enter gallery >>