Deep below the Earth’s surface, rock and mineral formations lay hidden with a secret brilliance. Under a black light, the chemicals fossilized within shine in brilliant hues of pink, blue and green.

Findings about the chemical makeup of cave systems can teach us about life in places humans have yet to reach.

Deep below Earth's surface, rock and mineral formations lay hidden ... As it turns out, the chemistry in South Dakota's Wind Cave is likely similar to places like Europa—and easier to reach.

It explains the concept of the water table, the process of groundwater flow, and the formation of artesian wells ... groundwater interacts with various rock types over time.

Michele Davis spent one of the last days with her son in her home state of South Dakota ... noticed two granite spires across a ravine, a rock formation known as the Praying Hands.

For an otherworldly end to your epic South Dakota adventure, don't miss the rugged beauty and mesmerizing geological formations at ... a bluff overlooking Table Rock Lake, the property features ...

The Yellowstone River is more than 600 miles long, traveling from south of Yellowstone to North Dakota's Missouri ... including its many colors and rock formations. Some visitors admired the ...

Fluorescent chambers inside South Dakota ... history and formation. Wind Cave was just one of their destinations. In other caves across the United States, they mapped the rock formations ...

I chatted with a bunch of locals to figure out where to go, what to do, and how to make the most of snowmobiling the Black ...