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?

When Floyd Collins ventured into Sand Cave in Kentucky on Jan. 30, 1925, he was searching for the next big attraction. But he ...

Located in western Rutherford County, Snail Shell Cave is 13 miles of underground water passage through the limestone of ...

Floyd Collins got trapped in a Kentucky cave 100 years ago this week, an incident that led to the creation of Mammoth Cave National Park.

When I discovered that Crystal Grottoes Caverns is the only publicly accessible cave in Maryland and has more formations per square foot than any other cave, I knew I had to visit. I was already ...

Here’s how. Collins is considered “one of the greatest cave explorers of all time,” according to the National Park Service. He discovered Great Crystal Cave in 1917, which his family ran as ...