Caves

A group of ring-tailed lemurs in Madagascar have made caves their nightly sleeping spot and are the first wild primates ever observed to return to the same caves night after night to rest.

A new attraction in central Kansas allows tourists to travel 650 feet (198 meters) underground and explore an active salt mine, and revel in the shimmering crystals.

More than 3,000 feet below ground, a new snail species has been discovered with a delicate, translucent shell.

Tackling this 2,000-year-old mystery takes a large and diverse set of experts.

The newly discovered labyrinth bugs were found in Kartchner Caverns State Park.

Now-extinct carnivores, such as saber-toothed cats, were lured to enter a deadly underground cave by the smell of rotting carcasses

These fish don't compensate for blindness with improved hearing.

The Greek cave collapsed and killed hundreds of people living there 9,000 years ago.

Explorers uncover deepest pit ever found in Lechuguilla Cave.

From crystal caves to never-ending lightning storms, here are some of the wildest and most unique spots on the planet.