Tourism, climate change, redevelopment and nature threaten the existence of some of the world’s most amazing sites, but – ...

Cave lions, larger than today's African lions, once dominated Ice Age Europe's mammoth steppes. These formidable predators, ...

The night sky in July a phenomenon that reminds skywatchers how remarkable it is just to be alive and to experience such ...

A rainstorm gathers over the Los Alamos National Laboratory campus. Photo Courtesy LANL BY XUAN-MIN SHAOLos Alamos National ...

False prophets, in sheep's clothing but inwardly ravenous wolves ...

When Mijares first excavated Callao Cave in 2003, he found 25,000-year-old evidence of human activity—but he didn't dig any deeper than about four feet down.

By contrast, lava caves, widely known as lava tubes, are formed in a geological instant—a year or two, sometimes weeks—by an eruption from the Earth’s crust.