Best for: sky-scratching views and adrenaline thrills
Duration: 10-15 hours
Standing at a knee-shaking 2,110m tall, Hvannadalshnúkur is Iceland's highest peak and the crown jewel of this fabled country's hiking trails. Although you won't need any previous experience (all hikes to the top must be guided), summiting the peak does require a hearty amount of guts and stamina - the mountain is set across Iceland's largest glacier, which also happens to hide an active volcano tucked under its ice sheet. Most of the climb is on snow-covered trails scored with icy crevasses, so all hikers must trek with a harness, crampons and an ice axe. Don't let this put you off - views from the top offer a mesmerising, whitewashed glimpse across the Atlantic.