The Mysterious World of Caves and Caverns: Ancient Man's Home Sweet Home (Slideshow)

Image credit: Philippe Bourseiller/Getty Images

There is, perhaps, nothing more primordial than a crackling fire in an otherwise-dark cave. Before civilization, before agriculture, we are told, humans sought shelter and found it in caves. They were humankind's first homes—and they continue to inspire our imaginations today.

Tags: Conservation