Iceland's Katla Ice Cave is a remarkable work of nature. Sculpted over thousands of years of glacial floods, icy blizzards, and volcanic eruptions, the cave sits inside the Kötlujökull glacier on top ...

A wildlife camera caught an amazing sight at California's Lava Beds National Monument, leaving park officials in awe. The short clip shows a black bear taking a sip of water from a pool inside a cave.