Geology

In 1954, two enormous earthquakes occurred just minutes apart, resulting in prominent scarps that extend for miles along the range fronts.

This igneous rock monolith towers above the surrounding landscape just outside the Nigerian capital.

This group of small islands on Lake Nicaragua formed after an eruption of the Mombacho volcano.

A little-known occurrence of fossil wood in northern Washoe County, Nevada, near the Black Rock Desert.

A spectacular overlook of the Little Grand Canyon of the San Rafael River, a deep sandstone gorge streaked with orange, red and white in a remote, uncrowded part of Utah.

In Rickwood Caverns, visitors can travel hundreds of feet underground and see beautiful formations unique to the region.

Approximately 50,000 gallons of water gush from these springs, creating the Metolius River.

One of almost 200 confirmed impact craters in the entire world, untouched for tens of millions of years.

It's safe—and permitted—to walk across these twin natural sandstone arches.

It's said that this stone with its mysterious runic inscription is evidence of the Norse visiting Narragansett.

This uniquely shaped rock formation is one of Scotland's most iconic mountains and gives spectacular views in all directions.

Since it formed millions of years ago, this cave system has been a sacred burial ground, a Prohibition-era speakeasy, and the center of an amusement park.

On the outskirts of an opal-mining town, these baths fed by a massive underground aquifer are a natural spa.