I stir a simmering soup and watch my five-year-old drill a hole in an agate he found. He tells me it’ll be a necklace. Safety glasses protect him from the spray created by the tiny diamond bit on the ...

Names smoked into the ceiling date back to the 1800s James St. John via Flickr under CC by 2.0 Underneath the rolling sinkhole plains of central Kentucky lies Mammoth Cave, a limestone labyrinth with ...

A mysterious and romantic property in Sydney with a homemade cave and a “moon bridge” is unlike anything else for sale. The listing photos show the man-made cave, complete with stalactites, in the mix ...

Prehistoric dots and crimson hand stencils on Spanish cave walls are now the world's oldest known cave art, according to new dating results—perhaps the best evidence yet that Neanderthals were Earth's ...