Cold air rushes from a small hole in the ground, whispering secrets of a world far below the surface. Imagine stepping across ...

Check out 24 of the world’s must unusual landscapes — from the hellish Darvaza Gas Crater in Turkmenistan to the “snow ...

Bulgaria is not just a place with rich history and breathtaking landscapes, it also has a hidden world beneath its surface ...

Genevieve Formation, one of four major rock formations within Mammoth Cave National Park. This layer of limestone and shale formed on the bottom of a warm ocean reef. Prior to research that began at ...

From lava flows to impact craters and fossil beds, this is a country where rock formations tell stories more powerful than ...

“Some scientists say these cave formations are all natural. There are about 19 interlinked caves. These trees growing out of the rock formations shows the symbiotic relationship of Natur ...

The rock formations and natural caves were carved out by erosion and weathering from sand dunes believed to be approximately 140 million years old, according to a now-deleted web page by the ...

A new tour of the famed Akiyoshido cave system here, one of the largest limestone networks in Japan, offers visitors the ...

Discover a unique cave hike in Connecticut at the Indian Council Caves in Tunxis State Forest. Explore rocky terrain and ...