Ice caves

The Eisriesenwelt (German for 'World of the Ice Giants') is a natural limestone and ice cave located in Werfen, Austria, about 40 km south of Salzburg. The cave is inside the Hochkogel mountain in the Tennengebirge section of the Alps. It is the largest ice cave in the world, extending more than 42 km and visited by about 200,000 tourists every year.

cave in Slovakia

thumb|Glacier cave near Kverkfjöll. thumb|Warning text about the caves.

cave in Russia

ice cave in Romania

natural cave, often lava or limestone, containing percolated water at temperarure ≤︎0°C.

cave in Fanlo, Aragon, Spain

thumb|right|Víðgelmir in Iceland - Expeditioners are walking on top of a "pipe" formed when half molten lava "skin" rolled down the walls when the eruption receded. thumb|right|Víðgelmir has many ice-formations deep within the cave. Víðgelmir () is a lava tube situated in the Hallmundarhraun lava field (formed around 900 AD) in west Iceland, around 2 km southeast of Fljótstunga farm in Hvítársíða, Borgarfjörður. The roof of the lava tube has collapsed, creating two large openings near its north end which are the only known entrances. Víðgelmir is 1585 m long and the largest part of t

cave

ridge of bedrock in the state of New York

lava tube in Japan

thumb|Area near the entrance of Raufarhólshellir showing Stalagmite#Ice stalagmites|ice stalagmites and part of the metal walkway thumb|Detail of the cave wall, showing bathtub rings and red-on-black coloration Raufarhólshellir () is the fourth-longest lava tube in Iceland. The cave's proximity to Reykjavík made it popular with visitors, who caused damage to the cave. In late 2016 the cave was closed to the public to clear accumulated garbage and install lighting and a walkway to part of the cave. The cave reopened for guided tours the following year.

Volcanic cave of Mount Etna in Sicily, Italy

limestone cave in Albaerta, Canada

ice cave that only forms ice in summertime, Coudersport, Pennsylvania, USA