A member of the Iranian Caving and Speleology Association confirmed the discovery of this limestone cave in Barzok by a local resident. The cave features multiple chambers and passageways and ...

Climbing down past an ancient heap of bird guano and pushing through a gallery of gleaming pillars the color ... its limestone is riddled with some of the planet’s most extensive cave systems.

The stone in the caves was originally limestone, a sedimentary rock made ... The water owes its brilliant azure color to glacial silt, which is also known as "rock flour." This fine stone powder ...

ISLA: To Traligill Caves! They’re in the North West Highlands GeoPark and they’re made of limestone. There are three cave entrances in the limestone in this area. But we have to be really ...

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 Park encompasses about 80 square miles.