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” boots, in order to ...

The death of Floyd Collins one century ago is being remembered as a catalyst for the formation of Mammoth Cave National Park, ...

Floyd Collins squeezed himself inside Kentucky's Sand Cave in hopes of exploring its caverns and turning it into a tourist ...

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?

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 ...