Glaciar Perito Moreno
Possibly the world’s most dynamic glacier, the Perito Moreno in Argentina advances up to 2m per day, which means plenty of exciting, spine-tingling calving. It’s supremely accessible, too – you can get very close to the action via a complex network of steel boardwalks, perfectly situated near (but not too near!) the glacier’s face. Everyone stands there, watching in suspense, for the next building-size chunk to sheer off and slowly tip into the water below, creating thunderous crashes and huge waves. Trust us, it’s awesome.