Niter Ice Cave

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." 

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

Cave carved out of a huge snow drift collapsed killing one and injuring five in July 2015.