Weeki Wachee Springs State Park in Florida has enchanted visitors since 1947 with underwater performances by "real" mermaids.

Explorers entered a flooded cave system hidden deep in the forest, where light barely touched the water. As they swam through freezing tunnels, their flashlights caught pale, eyeless fish gliding ...

This was no ordinary cave expedition—this deep river cave had us wading through water, dodging fallen debris, and discovering incredible underground formations. From eerie salamanders to the unknown ...

When he noticed water coming out of the walls of the cave he had been exploring in Kentucky on Thursday, Clemson University student Riley Blais knew something was wrong. Then he, and the other geology ...

The Lava River Cave exhaled chilled air. I put on my sweatshirt, despite the hot July day. Though I'd been warned about the sudden drop in temperature to a crisp 42 degrees, it was hard to believe I'd ...

POLEBRIDGE - Beneath: a bed of soft sand pressing damp and firm against shoulder blades. Above: a glittering sky, starry pinpoints against unlimited black, deep as time. All around: the song of the ...