Ox Bel Ha, located beneath Mexico’s Yucatán Peninsula, has officially reclaimed its title as the longest underwater cave system in the world, stretching an astonishing 524 kilometers. This submerged ...

Called one of the most isolated parts of the world, as many as 19 uncontacted Amazon tribes make their home in this region. It comprises an area about the size of Austria—or 33,000 square miles. In ...

Hidden lava tunnels on the Moon and Mars could one day shelter human explorers, offering natural protection from radiation and space debris. A European research team has unveiled a bold new mission ...

Add Yahoo as a preferred source to see more of our stories on Google. Photo Credit: iStock Scientists used a handheld laser scanner to build the first-ever 3D maps of caves beneath the Grand Canyon's ...