Geology

The site of a devastating modern-day mud volcano eruption that buried parts of a village.

Hide from the tourist hordes in these relatively unknown, and unguarded lava caves.

Who needs fancy modern water slides when this giant North Carolina rock works just as well?

This naturally heated mountainous creek has created a group of neon blue pools of potentially deadly boiling water.

A trio of red, white, and blue stones embedded in the streets of Leiden are markers of medieval territory and law.

The true age of this ancient stone circle is unknown, but its stunning vista isn't in question.

These black pillars of volcanic basalt seem to call mountain climbers with an unbreakable siren song.

These layered sandstone mountains in China look like they are made of pressed crayons.

Iceland's "Smoky Valley" is a beautiful river that is shrouded in a constant cover of steam clouds.

North Carolina's finest examples of Native American pictographs have survived for 5,000 years.

California's own majestic geyser is powered by a subterranean volcano.

In legend, this ancient dolmen was said to have been created when a troll tried to destroy a church.

Twisted girders are all that remain of an Icelandic bridge that was wiped out by a combination of volcanic heat and glacial floods.

This French "sea of rocks" is packed with stunning rock formations and its own medieval castle.