Caves

A scenic canyon with thick forests and historic ruins.

A cavernous three-story, 43,800-square-foot basement that was forgotten about for 60 years.

Abandoned tunnels dug for the once-thriving sea salt industry on the coast of southern Spain.

This natural wonder drops 16 stories straight down through rare flora and streaming waterfalls.

A Texas cave network is home to some of the world's most spectacular-looking and bizarrely named mineral formations.

Stenciled handprints and wall paintings dating back 10,000 years, some of the earliest forms of cave art.

The cave where two British judges hid in exile after sentencing the king to death.

The historic cave is both a symbol of superstition and black magic and inspired one of the early Christian converts in Botswana.

People have been living in the cave houses on this Italian hillside since the Neolithic era.

The abandoned mine where American troops discovered a treasure trove of art and artifacts hidden by the Nazis.

The long underground cave's curiously shaped stalagmites have inspired many legends.

A cave in southern Italy adorned with thousand-year-old Biblical frescoes existed in obscurity until fairly recently.

A hermit's tiny cell built into the cliffside that saved him in South Pembrokeshire.

This network of tunnels housed an entire village for years, and even had a hall for screening movies.