Mammoth Cave National Park, home to the world’s longest known cave system, stretches for more than 680 kilometres, and ...

Some caves are small and tight — this one is the opposite. This river cave is so massive it feels like an underground world, with water still flowing through it like a hidden highway. The deeper it ...

They found a stone cave deep in the forest and gave themselves just 48 hours to turn it into a stone house by hand. Working ...

An underground chamber found in Jubilee cave is the largest known in Israel, rising over 10 stories tall beneath Ofra.

On Mars or the Moon, researchers use high-resolution optical cameras to spot “skylights,” which are essentially holes in the ground where a cave roof has collapsed. But on Venus, the thick atmosphere ...

In one of the most baffling discoveries of the last decade, scientists have found a clue in a cave to how life might survive ...

Above ground, Cappadocia feels otherworldly. Wind-carved fairy chimneys rise from dusty valleys, their pale pink and honey-coloured rock glowing under.

Here’s how to plan a trip to Mammoth Cave National Park.

Hidden in plain sight just outside of San Antonio is Bracken Cave Preserve, home to the largest bat colony on Earth. More than 15 million Mexican free-tailed bats pack into this limestone cave every ...

As nations posture over access to rare earth deposits, scientists say these coveted materials are hiding in plain sight – and can be harvested without any conventional mining at all.

With new technology, smarter tools, and a lot of patient digging, historians and archaeologists are uncovering marvels from every corner of the world. One day it’s an enormous thigh bone from a ...

Every year at Grand Canyon National Park, millions of visitors from all over the world stop at one of a dozen water spigots. Most people are on a rim, seeing the canyon's majesty for the first time, ...