David Fox

Starting from an abandoned cosmic-ray research facility (which is just as cool as it sounds) through sloping meadows pockmarked with mazes of boulders, criss-cross a few sheer drops and snowfields, and then scale the ledge to the top where you peer over a basalt cliff into the giant crater, colors glowing with ancient volcanic violence. This hike begins at an altitude of 3,250m above sea level....