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.

Protected by sheer cliffs, jagged mountains and limestone caves, these plants and animals ... As we walk through acres of lush forest inside the sinkhole, he points to a cliff above us.

They had crawled into Cave of the Winds, deep inside a cave system known as Clearwater ... from moon-pale banks of sediment in the Drunken Forest—a cave named for formations that tilt at ...

One of the great challenges of filming inside caves is lighting them ... the collapsed rock and now there is a unique underground forest, around 200 metres beneath the Earth’s surface.

Discovered in 2000 by an amateur cave explorer, the Grotte de Cussac holds ancient human remains, traces of long-extinct bears and stunning, fragile artworks. Deep inside this labyrinthine cave ...

On March 1, park staff spotted one that's particularly rare inside of caves here. "We started to notice these...small mounds of dirt, and we found, after closer inspection, that it was a very rare ...