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

Some now serve as makeshift homes for families as they wait ... A displaced girl poses inside an underground cave in the southern countryside of Idlib on November 26, 2014. She's one of over ...

Deer Cave is home to several species of bats ... was so enormous—nearly 500 feet high—that the sun reached deep inside and fresh air followed, creating a strange and wonderful habitat in ...

Walking into Fingal's Cave is like walking into the heart of the Earth. Here among the towering basalt columns, the visitor stands inside a lava flow. Magma that swelled up from deep in the Earth ...

Marina stood at the mouth of the Rising Star cave and looked inside. Outside, it was the rainy season in this grassland part of South Africa, home to jackals and porcupines and cobra snakes and ...

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 ...

Our home base, the ‘Ares Station’, is about one kilometre inside a mountain in Cantabria, Spain. There’s very little light inside the cave, and I shivered in the damp air, which stayed ...