Caves

This remote Scottish cave has been a site of Christian pilgrimage for many centuries.

A complex of ancient Buddhist rock-cut caves with a large, well preserved prayer hall.

Inside a former smuggler's cave, an artificial waterfall and light show.

Once an erosional cave, this scenic arch was lifted up above the sea's surface by an earthquake.

See the imprints of ancient trees, burned and preserved by lava.

The bones of prehistoric animals and early signs of human habitation have been found inside Malta's "cave of darkness."

A small cave network was discovered under a home in Xagħra, in 1924 when the owner was digging a well.

In 1888, a resident of Xagħra, Malta, discovered a small underground chamber filled with stalactites and stalagmites when digging a well.

A former smuggler's haven houses "The Chapel" and its mysterious carvings.

When California condors were hovering on the brink of extinction, this recovery program was charged with helping the birds thrive again.

Once a huge limestone cave that collapsed thousands of years ago, this scenic ravine is also an important archaeological site.

Erosion has transformed this sandstone boulder into a massive dune-filled cavern.

Hidden in a cave on a small Taiwanese island, a stalagmite reported to look like the bodhisattva Guanyin.

Local legend says a monk brought Christianity to Bornholm through his sermons in a cave inside this free-standing rock.