Doldenhornhutte, Swiss Alps
Above the alpine city of Kandersteg, the Doldenhorn Glacier lies on the northern flank of the Doldenhorn peak, which extends 11,287 feet (3.44 km) above sea level. The hike to the peak comprises mostly of steep, unforgiving gradients, punctuated by flat trails. In winter, it's impossible to scale this peak without snow shoes, and the threat of avalanches is an ever-present hazard.