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

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

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.

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