Where are the Rainbow ice caves?

A stunning discovery, a “rainbow cave,” was caught on camera at Mount Rainier National Park. It was seen illuminating the inside of an ice cave, and the cold crystallized colors were caused by naturally occurring algae.



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Formed during the ice age 3 million years ago, the Ningwu ice cave stays frozen all year round.

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The Ice Cave you will see is safe because we take care of it, we know it well and we see the changes. Don't be silly, take a guide! The Icelandic Civil Protection is strongly advising to not visit glaciers on your own.

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By far the highlight of our trip!! It was amazing to see the naturally formed Ice Cave. There weren't that many people when we got there so we had amazing photo opportunities. The drive to the cave was scenic and our driver was amazing at navigating the roads.

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Planning a Visit? Mammoth Cave in Kentucky is the world's longest known cave system, with more than 400 miles explored, and one of the oldest tour attractions in North America. Mammoth Cave National Park preserves the cave system, a part of the Green River Valley, and the rolling hills of south central Kentucky.

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11 Spectacular Ice Caves Around the World (PHOTOS)
  1. Eisriesenwelt, Austria. ...
  2. Mer de Glace Ice Cave, France. ...
  3. Rhone Glacier Ice Caves, Switzerland. ...
  4. Narusawa Ice Cave, Japan. ...
  5. Mendenhall Glacier Ice Caves, Alaska. ...
  6. Los Glaciares National Park, Argentina. ...
  7. Dobsinska Ice Cave, Slovakia. ...
  8. Big Four Ice Caves, Washington.


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Northernmost and Coldest Caves in the World: Greenland Caves Project (Hazel Barton) | Northern Rocky Mountain Grotto.

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During the winter they can go down to -10°C (14°F), and even below that. They are made of ice after all! That's why it's really important that you wrap up warm when visiting the caves. If you suffer too much from the cold, you just won't enjoy the experience as much as you could.

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The Narusawa Hyoketsu Ice Cave has many stairs because it is a pit type cave. The stairs are primitive and were made by piling up stones. The moisture causes the stairs to be slippery, so be careful. In early spring, ice makes the stairs slippery as well, so wearing high heel shoes is extremely dangerous.

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Glacier ice is blue because the red (long wavelengths) part of white light is absorbed by ice and the blue (short wavelengths) light is transmitted and scattered.

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An ice cave is any type of natural cave (most commonly lava tubes or limestone caves) that contains significant amounts of perennial (year-round) ice. At least a portion of the cave must have a temperature below 0 °C (32 °F) all year round, and water must have traveled into the cave's cold zone.

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