Skylight Cave in Oregon. Skylight Cave is actually a lava tube, a hollow tube that was formed by lava flowing through a ...

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Writing in the journal Antiquity, Professor Jan Simek of the University of Tennessee and colleagues have published images of giant glyphs carved into the mud surface of the low ceiling of a cave ...

Among the cave-centric park units within the National Park System, Mammoth Cave National Park in Kentucky stands out. Not ...

The trail disappears before me into a difficult pile of breakdown—building-size blocks of stone that have fallen from the ceiling and crashed onto the cave floor. I crane my head back ...

But the cave is no minor feature. It is giant-scaled, a leviathan’s burrow up to 40 feet in diameter, littered with massive, angular blocks of basalt calved from the ceiling. Around 100 yards ...