Take an otherworldly journey through Hang Son Doong, the world's largest cave located in Vietnam. The cave is more than 500 feet tall, 650 feet wide, and 29,500 feet long. Video courtesy of Ryan ...

There is a cave in the world which has its own ecosystem. This cave has a forest, river, rocks, trenches and much more. It was declared the world's largest cave in 2009.

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A team of researchers plucked the fossils out of rocks inside Mammoth Cave, the longest cave system in the world. Mammoth Cave is a treasure trove for ancient fish fossils, with more than 70 ...

A jungle inside a cave? A roof collapse long ago ... they felt certain they had discovered the largest cave in the world—and they might be right. There are longer caves than Hang Son Doong ...

two of the top three largest known caves in the world. To get there, a punishing path and 90 percent humidity test even the fittest hiker. A walk for the fortunate few: Only a limited number of ...

Scientists have found ancient nail tooth shark fossils deep inside Mammoth Cave in Kentucky, revealing new information about ...

The Extremes crew had trekked for two days through steep valleys covered in lush jungle to reach Hang son Doong cave. Set deep inside Phong ... beauty of underground world like never before.

This article explores these hidden treasures, uncovering their beauty and importance. At over 24 kilometers long, Postojna ...

the sound can be heard anywhere from within the cave system, which covers about 64 acres (260,000 square meters). That makes it the largest musical instrument in the world. We’ll save the ...

Discovered in 1999 inside an abandoned mine in Southern Spain, Pulpí Geode is the largest crystal 'cave' of its kind in the world. But what exactly is a geode and how do crystals form inside them?