The Apostle Islands National Lakeshore ice caves were open Monday, Feb. 16, for the first time since 2015, with large crowds descending on frozen Lake Superior in northern Wisconsin to see them.

From lava tubes on Mars to ice pockets on Europa, subterranean environments may offer the best chance of finding life—and living safely—beyond our planet. “I was like, ‘OK, I'm pretty sure that ...

Caves are natural holes underneath the surface of the earth that are hollowed out rock typically formed by water. If you’ve ever been able to visit one in person, you know how amazing it feels to ...

The U.S. Coast Guard has released video showing a rescue of three people trapped by rising water near Panther Beach in Santa Cruz County, California, on May 17. Eight people were rescued after a ...

Guizhou is not the only part of China turning its natural cool-climate resources into tourism opportunities. Heilongjiang in ...