The infernal environment and the presence of the crystals has required the development of specific equipment and technology, ranging from refrigerated suits to “crystal-friendly ... when the cave was ...

Crystal Cave was opened to tourists soon after it was discovered. However, tours were originally offered by boat. Now, you’ll ...

Once submerged under the sea millions of years ago, the Cayman Crystal Caves were shaped by water erosion, creating rooms filled with stalagmite and stalactite formations. Over time, dripping ...

and Lake Cave is home to a beautiful underground lake with crystal-clear water. In each cave, you'll likely spot fruit bats hanging out on the ceilings. The bats come and go as they wish ...

Discovered in 1999 inside an abandoned mine in Southern Spain, Pulpí Geode is the largest crystal 'cave' of its kind in the world. But what exactly is a geode and how do crystals form inside them?

Inland blue holes, however, are unlike any other environment on Earth, thanks largely to their geology and water chemistry. In these flooded caves, such as Stargate on Andros Island, the reduced ...