A jungle inside a cave? A roof collapse long ago in Hang Son ... Moss-slick boulders and a 30-foot drop test author Mark Jenkins at the forest shrouded entrance to Hang Son Doong.

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 ...

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.

They were made at a time when Western Europe was dominated not by forest, but by fertile steppes ... Because the paintings are often found deep inside caves in spots difficult to get to, it's ...

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.

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.