We’re on a cliff roughly 3,500 feet above the Colorado River at the tip of the Great Thumb Mesa, a spectacular formation that thrusts out from the South Rim of the Grand Canyon like the bow of ...

450-million-year-old fossils of ancient giant snails and squids. Ceilings that rise 100 feet in the cave's Grand Canyon area.

Enshi Grand Canyon-Tenglongdong Cave UNESCO Global Geopark in the southwest of Hubei Province, China, is home to world-famous erosion and dissolution landscapes and the rich cultural heritage of the ...

Globally, caves provide important refugia for bats. The Grand Canyon, more than 400 km (250 mi) long, consists of steep-sided, rocky formations with hundreds to thousands of natural caves. Two of ...