Add Yahoo as a preferred source to see more of our stories on Google. We see four images of a horse painted on a cave wall. The bottom two images are brighter. Using an unconventional, centuries-old ...

Archaeologists found three new drawings from tens of thousands of years ago in a Spanish cave. They used a visual technique called stereoscopic photography to see the cave art like never before. The ...

In the absolute darkness 333 feet beneath Tennessee's Cardwell Mountain, I am belly-crawling through a passage barely wider than my shoulders, headlamp cutting through blackness so complete it seems ...