The Shoshone Ice Caves is the longest ice cave system in the world.
The Shoshone Ice Caves are a magnificent natural wonder that also happens to be the largest cave system in the state of Idaho. From May to September, visitors can take a tour of this truly incredible place by descending 100 feet underground and seeing firsthand the 1,700-foot-long cave system. Not only is this the largest cave in Idaho, but it is the longest lava ice cave that we know of in the entire world. The ice caves were used as a trustworthy source of ice for the surrounding area in the 1800s.
The ice in the caves comes from cool air that drifts through the cave systems, causing the water that’s located underground here to freeze. It is frozen year-round, so be sure you dress accordingly if you plan to pay a visit! The caves took some damage in the 1940s due to overdevelopment, but the Robinson family that acquired the ownership of the caves thankfully were able to restore it. This fascinating geological phenomenon is surely something you won’t want to miss out on if you find yourself in southern Idaho.