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Jan 22, 2014 06:30 AM ET
Imagine a cave filled with the oldest known human-painted images, dating back over 32,000 years. Trace recaps the highlights of Director Werner Herzog's trip into the ancient Chauvet Cave in "Cave of Forgotten Dreams."
Oct 11, 2012 01:47 PM ET // Tim Wall
A newly discovered species of reef coral hangs from the ceiling of undersea caves like a colony of petrified bats.
Apr 11, 2011 08:18 AM ET // Tim Wall
Insomnia is a matter of life and death for blind cave fish, an evolutionary trait that may lead to insights on human sleep disorders.