Ice Caves

A lava tube cooled to form this long tunnel that stays chilly even at the height of summer.

This human-made cave is one of the many snow storage chambers that supported the ice supply industry in the Sierra Mariola area.

This underground cave located in the most barren reaches of Idaho is filled with ice year-round.

Chilly air billows out from the entrance of an abandoned mine on a steep hillside, providing a refuge for Ice Age fauna and flora.

Each winter this underground cave forms a dazzling ice palace.

The largest known open fault in the United States is basically a giant natural refrigerator.

A 70-foot-deep ice cave formed by lava from Mt. Fuji on the edge of Japan's "Suicide Forest." 

This frozen tunnel in central Alaska is both an engineering feat and a valuable climate classroom.

A rare chance to get up close and personal with a 13-mile ribbon of ice near downtown Juneau.

Contrary to what one might expect, ice forms inside this small cavern during the summer and melts during the winter.

Southern Ocean waters and glacial forces transform the Antarctic ice into these stunning bridges and caves.

A glacier pocked with ice caves and surrounded by rainforests.