Hang Son Doong is the world's largest known cave, with enough space in some of its passages to fly a Boeing 747 airplane through them. The limestone cavern sits beneath a lush jungle in Vietnam's ...

Many of the world's subterranean wonders now double as concert venues. Italy 's Cave of Music, known for its acoustics and ...

Then, long buried under later deposits, the dead reef became limestone, the ideal stone ... milky mounds of calcite unlike any cave formation I had ever seen. In some places, rows of ghostly ...

On the edge of the Peloponnese, Kastania Cave is a three-million-year old geological wonder with breathtaking stalactites and ...

Underground rivers dissolve the limestone and carry it away to leave ... This is a calcium carbonate deposit like an icicle formed in caves by chemical precipitation from drips or thin films ...

Sistema Sac Actun is the world's largest underwater cave at 215 miles, a breathtaking labyrinth of nature and history beneath ...

Under a swath of Kentucky hills and hollows is a limestone labyrinth that became the heartland of a national park. The surface of Mammoth Cave National ... which combines geology with Mammoth's ...

Sistema Sac Actun is the world's longest underground river, stretching an astonishing 95 miles beneath the Yucatan Peninsula ...

A Lake Shasta Caverns official said the lighting work is the largest renovation project since the caves opened to the public ...

Coronado Cave is a limestone cave in Coronado National Memorial ... stalagmites and other formations. The cave is accessible via a moderate, 0.75-mile hike from the park's visitor center.

The limestone in the Marble Arch Caves formed around 330 million years ago You may know what a cave looks like, but can you define it? A cave is a natural underground chamber and the Marble Arch ...

MINE, Yamaguchi Prefecture—LED lights installed to illuminate spectacular natural formations in one of Japan’s largest limestone caves are turning the milky white stalactites green. Experts ...