2026年6月28日

Cerulean Skaftafell Ice Cave, Iceland

Hidden just outside Juneau, Alaska, the Mendenhall Glacier feels almost unreal, inside and out. Step into one of its rare blue caves, and the world turns quiet and luminous, with light filtering through centuries-old compacted ice. The glacier stretches about 13 miles from the Juneau Icefield, slowly flowing toward the valley below and reshaping itself year by year. While reaching the caves has become increasingly rare and unpredictable, the glacier remains closely studied, offering scientists a visible record of environmental change.