These Pennsylvania rocks conceal an ancient maze you can walk through, making it a unique destination for adventure seekers.

In 1869, John Wesley Powell was studying layers of rock in the Grand Canyon when he noticed an unconformity in the layers. Around a billion years were missing, and the problem turned out to be global.

Shawnee National Forest turns Illinois rugged, with sunset cliffs, mossy canyons, and trails that trade noise for wonder.

Over the last few decades substantial progress has been made in understanding the structure of tectonically active rifts, failed rifts, and ancient passive ...

The soda straw formations are another geological curiosity that sounds more like something from a diner menu than a cave ...

The historic Chateau at the Oregon Caves is an architectural gem that deserves recognition beyond its role as a place to ...