Caves

Bacteria aren't just tenants inside Sweden's Tjuv-Ante's Cave. The microbes are building calcite dripstones on the ceiling.

In Sweden's Tjuv-Antes cave, bacteria help build fanciful rock formations called dripstones.

A 3D modeling technique allows researchers to stay dry while studying skeletons found in a deep underwater cave on the Yucatan Peninsula.

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.