WHOLE CAVE IS MADE UP OF GLACIER

This cave name is "Vatnajokull" and is located in Iceland.
This cave is opened for tourist.These type of caves are formed by melting glacier water.
This cave is the largest ice cave in Europe.
This cave is so large that it covers 8 percent of the area of Iceland.
This cave can be dangerous for tourist because glacier are constantly breaking and changing.



pictures are from http://www.boredpanda.com/amazing-caves/