Spelunkers have probably heard of the largest, most unexplored cave in the world, but there's one that might be more fun to visit. Oregon's coastline harbors a natural wonder that makes average ...

Ancient humans hunted and butchered a cave lion around 48,000 years ago, a study of the prehistoric big cat skeleton has found. The findings represent the "earliest direct evidence of a large predator ...

During the last ice age, the Earth was home to significantly more megafauna -- animals with adult body weights over 100 pounds -- than it is today. The Woolly Mammoth is one of the best-known examples ...