Each year, locals dig a walkable ice cave, or ice "grotto," directly into the glacier's deep blue ice. Even better, the ice grotto is only a short distance from the Chamonix train station via a ...

In an ice cave, the distance between you and the rich blue ice around you vanishes. I walked into one such cave in southern Iceland, delicately through a tunnel of circular ice arches. They ...

But during the last ice age when sea levels were much lower, the caves were the high-and-dry habitat for a completely different group of animals. On one dive into a blue hole on Great Abaco Island ...