Researchers from the Wildlife Conservation Society have stumbled upon a geological colossus in a remote corner of Afghanistan: a natural stone arch spanning more than 200 feet across its base.

The famous Darwin's Arch rock formation in the Galapagos Islands has collapsed. On Monday, Ecuador's Environment Ministry announced on Facebook that the iconic natural structure lost its top.

A massive stone archway, one of the largest natural bridges in the world, has been discovered in a remote corner of Afghanistan.

A massive stone archway, one of the largest natural bridges in the world, has been discovered in a remote corner of Afghanistan. The dramatic arch spans more than 210 feet (64 meters), edging out ...

The historic December storms that drenched California and dropped record-setting snow on the Sierra also destroyed a centuries-old landmark — an iconic stone arch on a secluded beach that has ...

Experience this stunning sacred mountain in China - one of the country's most important peaks boasting intricate temples, ...

This natural stone arch is at the 15.1-mile point on the Catalina Highway above the road on the left when driving up the highway. Photos by Doug Kreutz / Arizona Daily Star ...

Arch-like rock formations can be seen elsewhere in the National Park system. Arches National Park, which is located in southeastern Utah, has more than 2,000 natural stone arches.

Arch Resources and Consol Energy have agreed to combine in an all-stock merger of equals to create a new $5.2 billion entity called Core Natural Resources.

Biomaterials in interior architecture: aesthetic and responsible solutions for sustainable spaces.

This snake began a slow, slithering ascent from the base of a natural stone arch along the Catalina Highway northeast of Tucson. It’s very unlikely the critter got very high on the formation.