Explore stunning cave hikes in Illinois with towering sandstone cliffs, hidden rock shelters, and dramatic natural arches waiting along scenic forest trails.

Sea fossils found on some of the world's tallest mountains are reigniting fierce debate over whether the biblical story of Noah's Great Flood could be rooted in real events.

The Boring Company has officially began drilling a tunnel between downtown and the airport. City officials and residents remain unclear about the potential impact to Nashville’s underground ...

Here’s something that’ll blow your mind: this spectacular underground world was discovered completely by accident in 1963 ...

This small natural pool lies in the limestone rocks of Comino Island, Malta. The clear Mediterranean seawater collects inside the rock cavity near the coast. Many visitors explore the rocky shoreline ...

Marine fossils discovered near the summit of Mount Everest reveal that the world’s highest mountain was once part of an ancient ocean floor before tectonic collisions lifted the Himalayas.