Missouri’s Meramec Caverns feature rare rock formations, rich history, and a colorful fall landscape above ground.

Hidden inside Vietnam’s Phong Nha-Ke Bang National Park is Son Doong, the largest cave on Earth. It’s so vast that a Boeing ...

An intrepid scientist and her team were the first to venture into the Wulff Land caves—and they found surprising evidence of Greenland’s prehistoric past. Paleoclimatologist Gina Moseley led a team of ...

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CAPE CANAVERAL, Fla. -- Scientists have confirmed a cave on the moon, not far from where Neil Armstrong and Buzz Aldrin landed 55 years ago, and suspect there are hundreds more that could house future ...