Climbing Kilimanjaro, Tanzania

Its famous snows might not survive another generation, but reaching Africa's roof is still this continent's quintessential adventure. More than 20,000 visitors tackle Kilimanjaro every year, though not all make it to the snow-crowned summit. The challenging ascent climbs through five separate ecosystems—from forest to grassland to sprawling moors—so it's worth stopping now and then to take in the views (or to just catch your breath). Pat yourself on the back when you reach the top, but don't be surprised if the triumph is short-lived: Brutal cold and punishing winds have most people scrambling back down once they've taken their snapshot.

For more information: Alpine Ascents