Caves are some of the most interesting and perplexing features on our planet. Here's how they form! Oh yeah and I did the math wrong in comparing the size of the cave to the grand canyon ...

By contrast, lava caves, widely known as lava tubes, are formed in a geological instant—a year or two, sometimes weeks—by an eruption from the Earth’s crust. Most of Hawaii’s lava tubes ...

Wisconsin gets incredibly cold in the winter, but don't let that frighten you into staying indoors: these incredible ice caves are calling.

Anyone visiting the caves can see streaks of white, brown and yellow along its walls - the white being a pure form of marble. When the blue lake waters ripple and reflect on the walls, the effect ...

Here's a look at others. Eben Ice Caves found in Rock River Canyon Wilderness The Eben Ice Caves are a well-known winter attraction in Michigan located in the Rock River Wilderness area of the ...