But as one careful step down led to another, the daylight slowly turning to a distant oval high above, this promise was my solace: We would see a wonder of the natural world, a cave that is the ...

Walk the 1.25-mile (2-kilometer) paved trail around the Big Room some 750 feet below the surface at Carlsbad Caverns National Park in New Mexico and you will view some amazing cave formations that ...

The decorative motifs, along with the placement of large rings around phallic stalagmites, led archaeologists to believe that the Tlacotepehua culture used them in fertility rituals. The cave’s ...

When scientists crawled into Mammoth Cave —a.k.a. the largest known cave system on the planet— they weren’t expecting company. But that’s exactly what they got. Not from bats, not from ghosts, but ...

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"That's when we discovered the two rings around the stalagmites." The cave, called Tlayócoc, is in the Mexican state of Guerrero and about 7,800 feet (2,380 meters) above sea level.

Mammoth Cave is a vast limestone cavern with over 420 miles of explored passageways spread across five distinct levels. It was designated a National Park in 1941, declared a UNESCO World Heritage ...

Previously, the world’s largest examples of selenite crystals came from a nearby cavern discovered in 1910 within the same Naica cave complex. Several examples from the Cave of Swords are ...