Imagine a cave where the walls are covered with huge, sparkling crystals, some as big as trees. This isn’t a scene from a ...

Maryland's only show cave might not be the largest, but it’s packed with stunning formations at every turn. Crystal Grottoes Caverns is a hidden gem that delivers a surprising underground experience ...

Naica’s Crystals Cave, maybe the most amazing underground wonder on Earth, was discovered by chance inside the deep mine of Naica, in the State of Chihuahua, Mexico. It is a true geode: a cave ...

Follow the river inside the pillars, and you will find more crystals along the edges and on the walls. The cave hidden inside this area also has tons of crystals, but this area is dangerous as it ...

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?